It could easily get to PS2 levels. That's how good the Fusion could be.

I think people are having troubles seperating a "hybrid" platform and "Fusion" platform. A "hybrid" platform would be one in which would require both sets of hardware, and I highly doubt Nintendo will do that. 

There already is a Fusion platform on the market ... the Vita/Vita TV is basically it, you can buy the handheld or you can buy the home TV version. It's your choice. You can have both even, but that's not neccessary. But they both play the same games. 

That said Nintendo has more drive to sell such a concept because they'd put their full software weight behind a concept (Mario, Pokemon, Zelda, Mario Kart, etc. all on one platform) so it would be far more successful. 

The iPhone-iPad-iPod Touch are another example of a Fusion platform, they are all different hardware lines, but they are all related and use the same app store and run most of the same apps. Even though there are some hardware differences (ie: iPad has more RAM and sometimes a better processor) they use basically the same technology too. 

The first question is : is Fusion really exist ????

i have predicted it will be fusion for the next future Nintendo project, but predicting the sales of thing that doesn't exist is impossible.

Well like I said in an earlier post, it largely depends on Nintendo's ability to fix mistakes they made with 3DS/Wii U while not making new ones in the process.

3DS+Wii U are on track to sell a combined 80-90 million by the end of the generation, if they hadn't made those mistakes early on then it's completely possible they would have been able to sell 100+ million combined.

If Nintendo comes up with a good strategy and executes it perfectly, we could very well see gen-over-gen growth. On the other hand, if they have a flawed strategy or don't have great execution than they may very well see gen-over-gen decline.

Prediction: the Nintendo Fusion does not and will not ever exist.

Hardly.  If it truly is what the rumors are, that the same games can be played across both platforms (and if Nintendo is going to sell them seperately), then there will be little to no reason to get the home console version.  It'll be worse than this gen.  Their home console will sell only to the more diehard Nintendo fans, while anyone else who is even interested in those games will buy the HH version.  And with the possibility of the HH market decreasing even more next gen, their HH version may sell worse than the 3DS.

I agree that PS2 level sales is very optimistic but it's completely possible this approach could sell better than 3DS+Wii U. For one, they don't have to seperate software development between two seperate pieces of hardware. The 3DS early drought and poor sales caused Nintendo to divert resources to 3DS to start pumping out more games which hurt Wii U early software output and sales, once they started to divert resources back to Wii U, 3DS started to suffer by 2014 having much lower software output compared to the previous year.

This type of situation no longer exists because they are essentially developing games for a single platform, meaning no more droughts and the ability to create new ip at a faster rate which increases their chances of creating the next big craze among kids like Pokemon/Skylanders/Minecraft. Also they will be able to spend all marketing/advertising resources to basically a single platform meaning the possibility for more brand awareness.

Also if they get launch price right and give them names that don't make people think they are revisions/add-ons for previous devices than that will benefit them as well.

While I agree that it would help with droughts, it also make one of the pieces of HW obsolete.  The only reason the Wii U is even selling at all is because a few diehard Nintendo fans are buying it and because of its exclusives.  If the Wii Fusion HC has no exclusives, there is no reason to own it.  Sales will be much worse than the Wii U, as people would just buy the HH model. 

That is if Nintendo decides to sell them seperately.  If they don't, to keep costs down, the power will probably be less than the PS4.  If they do sell it seperately, I still don't see the power being much more than the PS4, as that is Nintendo's model, now.  Power will also be limited by the size of the HH, and for the fusion idea to work more effectively, Nintendo is not going to want the power difference between HH and HC to not be too great, so they truly can make just one game.  Like I said above, that may be fine for Nintendo fans, but that won't fly with current XBO/PS4 gamers (read majority of gamers.)

Maybe the console would sell less than Wii U or maybe it would sell more by being cheaper and having more games. Also it's a very real possibility that people buy both despite sharing the same games, it's not like iPod/iPad are obsolete just because iPhone does everything they do and more. Also Apple TV has sold over 25 million despite essentially being an iPad 2 designed as a microconsole. Also Nintendo can always offer up things that better the game experience by linking a handheld and console together.

Also we don't really know if people buy Nintendo handhelds simply because they are handhelds, maybe they buy them because they have games people want to play like Pokemon, Luigi's Mansion, Animal Crossing, strong Japanese 3rd party support, these are all things that 3DS has but Wii U doesnt. Perhaps if Wii U had the game selection of 3DS it would be doing better than it is now without hurting 3DS sales.

I agree with u that the next console won't be extremely powerful but that doesn't really matter. I think the handheld will be less powerful than Wii U but use more modern components that will allow it to produce Wii U level visuals at a lower resolution, just like 3DS is weaker than Wii but more modern and able to produce Wii level visuals at a lower resolution. The console would then be a more powerful version of the handheld that is a slight boost over Wii U similar to the way Wii was to Gamecube, it plays all the same games as the handheld at a higher resolution with some extra graphical effects. As long as they dont add in expensive features like 3D or Gamepad then they should realistically be able to sell either device for $199 at launch.

If the concept ever actually makes it to market, I don't see it doing anywhere near that. 40 million, maximum.