Right now it doesn't make sense for ATI to drop prices. Even if fermi performs well, there currently still exists a market shortage in the high end GPU segment. The hd5870 is never and has never been fully stocked. Currently new egg has 10 models with only 5 in stock. Yes, plenty to choose from but they're all above MSRP. The hd5970 is nearly nonexistent. I don't regularly search of availability, but I've never seen it in stock.
Until, and more importantly IF, ATI sales start to suffer then they'll lower prices. Right now just be glad if the 5800 series goes down to it's current MSRP.