Unfortunately, some devs like the Heavenly Sword guys don't see 3D on the PS3 working for the big games like Killzone 2, Gran Turismo 5, God of War III, etc. Requires more horsepower than the PS3 has to output two HD screens which would be required. They say that the next generation of consoles will have the proper power under the hood to handle 3D.
Though we still need to see what the plans are from Sony.
Expect new consoles to be announced next year at E3 with releases in 2012.
There's also the question of cloud gaming from services like OnLive and Gaikai. That is if MS and Sony don't jump in as well.
And frighteningly, those people have no clue what they are talking about.
No more horsepower is truly required to output to 3D compatible TVs if it is done correctly. A little more resources might be required but devs are constantly pulling new tricks to break previous barriers.
Remember, many games run at 30fps. Yet, the TV still displays them at 60hz (effective. Various display types use different refresh rates and specific styles, i.e. plasma). Insert copied frames here and there, i.e. what the technology is already doing, just bump it up for 60hz each eye.
The PS3 will have to use a 120hz signal, or whatever the specific 3DTV requires.
Some resources will be required to manipulate the image for each eye, and that all depends on what exactly has to be done. Sony could have some fancy tricks they could pull still with a new firmware, that helps allocate resources for that task without doing much negative.
Just like the games at the end of a console generation look insanely better than the early games, the first- and second-party devs will work with SCEI to wrangle out a few new development tricks.
Same with the 360, I'd imagine.
I honestly doubt this will be a serious problem.
It might come down to using new engines that don't have the same top-of-the-line flash. If that's the case, we won't see the games for a little while.
But honestly, I am expecting a few tricks to make it work. Depends on the type of 3D. Producing separate images distinct from each other for each eye, rendered slightly different and not just shifted, ala a dual-cam style? That might require some extra work. We'll see. They could do some more simple manipulation on-the-fly with a more minimal resource load. I don't know what those devs are cooking up.
Quite likely, Ninja Theory has no idea either. The first- and second-party devs, at least for Sony, work some serious magic between the respective houses.