This depends on when your asking?

Back during the GameCube generation before the Wii was announced, did I think Nintendo's next home console would sell? I didn't expect Nintendo to break the PlayStation domination back during the GameCube era. I was a loyal supporter of Nintendo but came to the conclusion that only hardcore gamers and fanboys would support Nintendo in the future.

Or are you asking when the Wii was called the Revolution? Once I heard that Nintendo was launching a Revolution I had alot of faith that Nintendo would recover as king. I remember seeing the Wiimote at TGS and freaking out wondering what Nintendo had planned. I freaked out after E3 and expected Nintendo to take the top marketshare from Sony. To be honest I didn't expect 360 to be as successful as it has been!

As for DS I did expect over 100-million sold. I thought it would be a massive hit. Then again I expected Nintendo to support GBA another two or three years. I expected DS to be a massive success and I also for saw its massive victory over PSP.

Not to sound like I'm boasting, but I predicted the Wii was going to be a huge success when it was unveiled in 2006 at E3. I was on the video game board on IMDB saying the Wii will dominate this generation and people there laughed at my predictions. I knew the Wii was going to be huge because it was different and introduced new video game concepts.

I knew if it weren't for the Wii I would have gave up video games for good. I have been gaming since the Atari 2600 and it feels like "been there, done that" with games dressed with prettier graphics. I needed new experiences so I bought the Wii which is the only console I own.

I wasn't really concerned about video games in 2004 (I'm a lapsed gamer) so I was indifferent to the DS.

Well, yes and no. Mostly no.

I fully expected the Wii to do better than Gamecube - I didn't expect it to not only destroy its main rivals with both hands tied behind its back, but to beat the NES as well.

As for the DS, well - Nintendo has always been the sovereign in the handheld department, so I'm more surprised that the PSP managed to check it for a while. And then Nintendogs came and the PSP got overrun.

Personally, my first home console was the PS2 - had Nintendo not released the Wii as it was, it would've been my last, and I'd become a "full-time" PC gamer again.

I knew the ps3 wouldnt do as well after that HORRIBLE 2006 E3 LOL. Shot themselves in the foot that day... fun times fun times.

Yep. True believer since the beginning.

I didn't own a GameCube, PS2, or X-Box. My friends had all 3 and I played them all, but I mainly collected NES games and played StarCraft for years, with a little CounterStrike on the side. I didn't have a GBA either and barely played a few games on a friend's.

I read about the DS and how it had 2 screens, a touchscreen, and a microphone, and I knew it would blow the PSP away. I figured if anybody cared about all the power and non-gaming features of the PSP, then the XBox would have creamed the inferior PS2. The DS was the first system I ever bought on launch day, and it was amazing. As powerful as the PSP was, it couldn't even do PictoChat, let alone Kirby Canvas Curse or all the minigames in Mario 64 DS. I knew exclusive control schemes would be the future of gaming, because they allowed exclusive games and even exclusive genres, which lead to a more diverse library and a more diverse userbase, and everybody wins. The way the DS really surprised me was Nintendogs, Brain Age, and the complete makeover with the DS Lite.

I saw the first trailer for the Wii (and read about the Virtual Console) and I thought it could even be bigger than the DS if Nintendo pulled it off. The VC would represent the whole history of gaming, and the Wii remote would represent the future of gaming. I knew it would have tougher competition than the DS though, since PS2 was king of the universe at the time. That made me a little doubtful for a while. But once Sony announced the price of the PS3, and the last minute tilt functions of the SIXAXIS, and no rumble, and no Wii Sports, I knew Wii would destroy the PS3. Then I had my first Wii Sports party, and 4 of my friends bought Wiis after that. Then 4 of their friends bought Wiis, then 4 of their friends, then 4 of their friends..... and the rest is history. Wii Sports madness spreads like a plague to this day. Wii Sports truly is like Pac-Man; zero buttons and world famous.

The biggest surprise for me was (as cAPSLOCK pointed out) 3rd parties actively trying to sabotage the Wii. I really didn't expect this many companies to choose HD development over competing with Nintendo on their own platform, or to constantly insult, dismiss, abandon, and blame the Wii and its customers. But I knew if Nintendo could make a unique control scheme that truly offered something unique that anybody could do, they could win over everybody because they don't scare away girls and old people like hardcore gamers do with all the blood and guts and explosions and tits and whatnot. Most girls I know won't even touch a 360 or PS3 controller, or even a GameCube controller, but they'll play Wii, DS, and Flash games on a PC.

The other thing I didn't expect was for it to take this long for Sony and Microsoft to come out with their own motion controllers. They waited too long and gave the Wii too much of a lead. Now it's truly an unstoppable beast.

Now that every company has shifted into the next phase of game history where control schemes are more important than hardware, I really can't wait for the Vitality Sensor, Move, Natal, 3DS, and whatever crazy stuff comes next. With everybody competing in the control scheme arena instead of leaving it to Nintendo, the whole industry's really going to get fun and crazy.

EDIT: Whoops, sorry about the wall of text.  TL;DR: I was basically a retired Nintendo fanboy content with collecting tons of NES games and playing almost nothing but StarCraft, but once I heard about the DS and the Wii and their exclusive control methods I knew they'd take over the universe once again.

I believed in both. Maybe the extent of their success has taken me by surprise, but I knew they would both do well. Firstly, you do not underestimate Nintendo handhelds, and secondly, when Nintendo are talking about a revolution in gaming, you should sure as hell sit up and pay attention.

Nothing can stop Nintendo!

I hated the idea of the DS when it first was announced and released. I thought it was ridiculous and I wanted a new GameBoy dangit.

Love it now.

The Wii, I entirely expected from the get-go to own. I actually thought it'd do better than this - expected it to be at 70m by the end of '09.

DS, not so much. I didn't have much faith in touch screen tech back then.

Wii, more so, but I didn't think it'd be as successful as it has been. I was impressed with the E3 showings though.