I'll give this a shot, but it really would be quite difficult to really predict something like this. Also, some of my own personal taste may affect my judgement a bit, but here goes nothing:
Well, I think that Coldplay might be around for a while, or at least some of thier songs will last well into the future. I think that thier songs have a certain quality that can be considered "timeless" and perhaps future generations will listen to thier songs and consider them great, just as fans of today consider them great. I know that with Coldplay, you either love 'em or really hate 'em, so really this is only a guess.
I second Daft Punk though. LIke you said, they are most definately unique and I also think that music is taking on a more techno/trance sound. A lot of thier songs have only a few words, but I do believe that future generations will listen to them and fall in love with what they do anyway.
A singer I think will stand the test of time may be Christina Aguilera. She's always reinventing her sound and her style and she does have a damn good voice. I believe out of the female pop singers that arrived on the scene in the late '90's (Britney Spears, Jessica Simpson, Mandy Moore, etc.) Christina has been the most successful. Yes, you could argue that, but it's just my opinion.
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