[quote name='Jodou']I wouldn't give up the PS3 for dead even with PS4 coming this year. I could even see Sony doing what Bluray has with DVDs for first party titles, where you buy PS4 games and get the PS3 copy free. This is the first generation where old generation games are being phased out slowly by being developed on both platforms, so I see no rush to get the new system until the exclusives arrive.
PS3 still has a lot of life to live.[/QUOTE]
If they did that (which I highly doubt), why would you want to play the PS3 version? Additionally there were games that came out on PS2 as well as 360 and PS3 for a few years, it's nothing new. Most of the games announced for PS4 are not coming out on PS3. I really hope there aren't a lot of PS4 games that are also made for PS3 (or Wii U) as that will just bring down the PS4 version.
Back to the topic at hand... I am planning on getting a PS4 at launch and I don't expect to buy many PS3 games after I get a PS4, but I'm still going to keep one to play the great PS3 exclusives of the past 7 years. Plus there are still a few coming out before the PS4 (The Last of Us and Beyond), I'd get another PS3.