just connect the tab to the tv most tabs allready have minihdmi ports or use a gamepad and the as screen.

why buy a ps4 if u allready have a tab that can do the same?

Huh? It has to sell that low to drop the average by a small amount?

I thought another 80mill gen would make it lower to about 100mill average.

Bah, it's late, I dont want to think about math. I could but really dont want to. My guesstimation initiallly seemed enough for my comment. But thanks for the clarification.

Either way I still feel the total average will decrease.

I'm quite sure the PS2 was a lot weaker at its launch than the PS4 is right now. I mean, for a PC player at this time, the PS2 games just looked like shit. I had 8 times as much video memory, with bump map and texture compression.
On the contrary Killzone on PS4 looks quite good, looks quite good compared to PC, and will still look good in 5 years, even if outdated. So I don't think the hardware will be a reason for a quick launch of the PS5.

the ps2 was realy cheap and was a dvd player(when vhs was dieing and nobody had a dvd player). and they never talkd so much about the graphic(because the ps2 was the weakest of the 3 survivers).

and killzone looks okay. good for a console, thats for sure.  i mean some firstparty ps3 titles still look okay if compared to some ps4 3rd party games.

Here, you are now 100% talking about the launch of the PS2, the vhs area, dvd player. And Sony did talk a lot about graphics. They've even shown fake video to prove its power, and that's quite famous.

We were not talking about the launch, because the PS4 has an excellent launch that matches the PS2 launch.

What we were talking about is : is it possible to sell for more than 5 years with a weak hardware and a good launch ? Yes it is, the PS2 did it, and not just with a weak hardware, but with a massively outdated hardware at day 1. And, I can't see any reason for the PS4 not to do it with a tremendously better hardware (compared to PC at respective launch).

Dat 10+ year plan!!

Never said they weren't content. How have they not though? Let's begin with the fact that the PS3 has yet to reach 100 million sales. It's still what? 16-17 million sales behind with three new consoles out and two older ones still on the shelves? PS2 had the benefit of having the Gamecube and original Xbox leaving the market for that particular generation much earlier and only having three other consoles to contend with. The original Wii will probably be able to post some decent numbers as long as it stays on market, ditto for the 360, so that's just extra competition for the PS3 to deal with. Let's not forget that the industry is pushing out more and more last gen remakes that are considered, or at least advertised, to be better versions of their last gen counterparts. So people are given a little less reason to choose a PS3  over a PS4. Fact is, the competition is much more stiffer for a PS3 post-gen and last gen showed us that the console business is a marathon, not a race. The PS3 is successful, but I don't know if it'll be able to push 10 million for the rest of it's lifetime. 

ps4 will be at 199 before ps3 is at 99

ps3 was a worse ps1

ps4 is a better ps2 (if we talk only about the hardware itself and not game libary or competition)

ps3 will never reach 100m

ps4 will probably