The PS3 doesn't have much going for it with exclusives, yeah. Cross-platform titles have all been lacking, with the PS3 versions vastly inferior compared to others (Skyrim and Mass Effect 3, I'm looking at you). With the news that the PS4 was made for the developers to have an easier time with, I'm thinking it will help the cross-platform problem out a lot. The only games that I know will be PS4 exclusives such as Killzone Shadow Fall and Infamous: Second Sun don't look too interesting. The ones that will be on PS3 and PS4 have my attention. No point in buying a PS4 just for those. I can live without better graphics.
Games that are coded natively for the PS3 don't look so good on the 360 as well, such as FFXIII. It's the nature of porting to different platforms. Japanese games tend to look better on PS3 and American games are better on 360.
If the PS4 is going the way of the PC-compatible, then it's basically just becoming another XBox with a Sony-specific gaming server and Sony-specific hardware components. I don't think this is a good thing. A system like the PS3 offered a different approach to computing than your standard PC, allowing for exclusives like God of War 3 and the Uncharted series. But, by standardizing this, your gaming experience will end up essentially the same.
Sure, it's great for developers who can mindlessly make the same game for the three "different" platforms with ease now that the competition is all on the same page. And consumers won't have anxiety that their port of their favorite game is going to suck.
But in a world of "Call of Duty 32: Not This **** Again," and "Final Fantasy XLIX: We Swear It's The Final One" /knowinglook I think the industry is in danger of slipping into more-of-the-same even faster than it was before if you can't even get some variety in your choice of platform.