One hot topic the PlayStation 4 should not do is restrict the use of used games. Another that comes to mind is, like you said, keep games playable. It seems odd to me that PlayStation 3 games would not be compatible if the PlayStation 4 is going to be based on Blu-ray technology. Will Blu-ray movies go away as well for playback? And what about PlayStation Plus? Will that still be around for anyone looking to transfer from one system to the other? At this point there are indeed questions left unanswered about the PlayStation 4.
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It must have backwards compatibility to play my PS3 games at no additional cost or subscription plan. When I buy a new PC I still get to play my older games. I've made a nice collection on Steam and no matter what I upgrade to I will still be able to play my collection. Being able to build a game library is important. The fear that people will not buy new titles when they can play their older games is unfounded. Great games drive sales not the scarcity of games.
For god sakes, THEN KEEP YOUR PS3!