I'm just going to go ahead, and clear a few things up. These are common misconceptions about game development so don't feel bad.
Like I said before in another thread, having KH3 on a console other than the PS3 (unless it's multiplatform) would render the main KH's team's learning of how to make games with the PS3 useless.
This isn't how game development works.
Every single console game you've played was
ported, from the PC. Game's are ported to consoles using a
devkit. That's all "experience with the PS3" is. It's just experience using the piss poor devkit they made for the PS3.
If learning a new devkit is too hard for Square's developers to do then they shouldn't be working in the game industry. Especially a game industry where console exclusivity went extinct years ago.
Also, Square Enix moves people around to different teams after every project. People who just spent two years developing a game for PS3 are moved to a different team to develop a game for the 3DS.
The team member's aren't exactly consistent. This is true for any game studio making more than one game at a time.
Let's say Versus takes another year to be released. This'll be August 2013. Then KH3 takes about one to two years to develop. That'll be about August 2014 to August 2015. The PS3 will still be up and running at that time, I'm pretty sure.
Nope.
PS3, and Xbox 360 don't have much time left in them. Various publishers have already started moving their teams to start making game engine's meant for the next generation of consoles, Wii U and the other unnamed consoles. These are the same publishers that have pretty much been keeping those consoles alive these past few years.
Epic Games has already unveiled their next gen engine, and has displayed various tech demos of the improved particle systems, lighting, poly count, textures, ect.
2015 is when the PS3 will be in its purgatory state where the occasional title might be
ported to the PS3. the Wii U is coming out
this year.
By 2015 the Wii U will have already bee out for
three years.
Sony and Microsoft have already made it painfully obvious they're working on their next gen consoles, and have given a lot of hints of a late 2013/early 2014 release.
1. The main KH team already is learning PS3 mechanics and development.
No such thing. There's no such thing as "PS3 development". They know how to use the PS3 devkit.
When they're working on a PS3 game. Who knows what platforms various team members were developing for right before they were put on the 1st production team. not that it's relevant since game development doesn't work the way people think it does.
2. More people would have PS3's at about the time of what I estimate to be KH3's release, because if the PS4 is brand spanking new, then not as many people would have one, same as the Wii-U (I'm not entirely sure on its release date).
Wii U = 2012.
PS3 = 2013/early 2014? The most likely business move will be for Sony to announce the next Play Station console during E3 2013, and release it during the 2013 holiday season.
3. The main titles have been on Sony consoles.
Well considering Dream Drop Distance is a main title... and considering Square is not longer exclusively Sony...
4. The Wii-U is estimated to have the same graphical quality as the PS3/360, so what's the point if the PS3 can handle it just as well?
I doubt a Kingdom Hearts game would ever need very high graphical quality, considering its art style is faded out cell shaded toon style. They really only need a slightly higher poly and pixel count to have "smoother" looking graphics.
And graphics isn't really what the next generation is aiming for anyway. The 7th generation did a good enough job with poly count. Developers are focusing on lighting, particle systems, AI, etc.
Developers are focusing less on making games look pretty, and more on games feeling "big" and "flashy" in things other than the character models.
Versus will hopefully be done with in 2013. That means KH3 will likely be done by around 2015.
With that release date it's likely that it'll be out for 8th generation consoles, and maybe be ported to PS3 as well.