I don't know how long SE will support the PS3 version of this game, it is up to them to be honest. The fact that Yoshi-P admitted they are already having technical limitations on this game one year in worries me, period, regardless of what people play it on.

But I do know this:

Sony did say that they are standing by their claim of PS3 having a decade-long life cycle for the system. The System was released in Japan November 11th, 2006, and in the USA six days later. If they are running on the decade-long lifecycle, then the system itself only has roughly 2 years before that claim has run out. Now they did say if they could make it last longer they would, but they didn't know how much longer they would support it after the decade was up.

In the past:

The PS2 was released in 2000, and Sony stopped producing it in January of 2013 which is:
  • A total of 13 years in production
  • Lasting 3 years past the 'decade-long' life cycle they hope for their systems
  • Running 7 years after the release of the PS3

So if Sony handles the PS3 as they did the PS2, we have at minimum 2 more years of production for the system, and perhaps as long as (if it last as long as the PS2) 5 years of production.

I guess SE would have to decide if they wanted to keep support the system for this game that long, or if they would continue to support it if Sony stopped making it.