There won't be a console "upgrade" for a looong while, from a purely technical standpoint, even.
There are some mighty steps on the way to building chips with smaller than a 32nm process. 22nm maybe for expensive electronics, but at 16 and 11nm, the gate size is so small as to make quantum tunnelling (electron loss) a "pretty dang hard" issue (major understatement). That may extend to being financially impossible, at the commercial level, due to that darn physics thing. Even the 32nm and 22nm chips may not be affordable (by the avg console consumer) any time before ~2016 (if that), due to cooling issues and new material costs to manufacture those chips out of not-silicon. Because it can be made doesn't mean its affordable enough to go into a consumer device... not even close.
Even 32nm chips will bleed heat so badly as to force chip manufacturers to go massively parallel to gain any real speedups, while lowering their core frequencies, to reduce heat. (much like modern PC quad cores do already)
You can bet that there won't be a future CPU capable of running a single core at 3.2 GHz in the near future, if it has enough cores to be "faster" than the current gen as well (at least significantly faster -- i.e. worthy of a console upgrade. 6 3.2 GHz CPUs maybe... 16? not even remotely soon). That means all BC for this gen of consoles is... poof. gone, because making BC for an app which requires a single thread to run at 3.2 GHz run in parallel -- requires re-writing the app. It can't be done with an emulator, of any sort. (note that the PS3 actually has 2 PPU threads at 1.6 GHz, and the SPUs, since they sort-of enforce a parallel software architecture, maybe very well upscale at a lower clock... its *possible* that the PS4 could play PS3 games... but not the "XBox 720")
You might see parallel GPUs which outperform the current GPUs by a large enough margin to be considered an upgrade, but... I would say the leap from last gen to this gen wasn't even close to what previous jumps were, and the GPUs got a LOT faster. User experience == not much better, especially if they don't own a 1080p HDTV, and HDTV adoption seems unlikely to be there by 2012, at the current rates. Even if everyone could afford a HDTV, the diff between 720p and 1080p is hardly worth a console upgrade for most consumers (e.g. Wii.. perfectly fine for most gamers, apparently).
Development costs are skyrocketing for console development -- imagine the costs if every console suddenly became a super PS3, and required massively parallel programming to make a game cooler than the "last gen". If you think publishers want a new gen of consoles by 2012, you are waaay off base. They can't afford it. Publishers can hardly afford to fund AAA titles as-is -- the software libraries of the 360 and PS3 are only as large as they are *because* the two consoles are similar (in performance)... and I wouldn't call their libraries "large" by any stretch, compared to previous generations. Places like GameStop make the majority of their income from used game sales these days... from my standpoint, its not hard to guess why, or why the PS2 still sells.
The PS3 and 360 will shrink, come down in price, lower their power profile (more important in the coming years, of fossil fuel deprevation, than you may think), etc. But there won't be a PS4 or XBox "720" for a long while.
Nintendo is the only company with room to grow. MS will see that, and go there (cheap, simple, casual), if they are into making money -- I think they are. Sony... who knows, but I don't think they will make a PS4 anytime soon. 10 years... yeah maybe. 2016 end-of-life for PS3 maybe be an underestimate, IMO. 2014 is certainly the minimum for an affordable, faster console, and it has a mountain of obstacles to overcome at that.
If MS and Sony continue to make the 360 and PS3, the first to release a radical new design (i.e. non-BC machine that requires billions to develop and millions more, per developer, for publishers to radically revamp their game engines and "how to" ideas) will fail. The one who sticks with the current gen a tad longer, will get the love of all the publishers who watch the new console fail, and are glad they aren't throwing their money away on it.
Moore's Law is dead. Get over it, and give your PS360 a hug, because its your gaming buddy for a long long time.










