I also don't think Apple will drop them, but for pro users the lack of updates is a serious problem. It's not like they couldn't have bumped the spec a little every year to keep people happy. People were rightly frustrated by the lack of updates before the Mac Pro was launched, and I think many thought the launch was a signal that Apple took the Pro market seriously. The lack of updates since then serves as another reminder that you can't depend on Apple to deliver up to date hardware in that market.