Do you think there will be an even better card for mining?
No the marked will go backwards and we'll all be mining on cpu's again...
Do you think AMD will see listen to the bitcoiners and build GPU's with tons of stream processors?
Do you really think AMD is willing to invest millions in designing something for a niche marked? Even if they did the price would probably not be attractive by anyone but very large miners, why? just look at FirePro/Quadro and you got your answer...
I think you are sarcastic for your first answer right? XD
But really. You don't know if they will make something with a lot of stream processors. Look at the 6990. It's the fastest graphics card in the world...but not for our purposes. They can make faster and faster graphics cards, but if they don't have stream processors, we would all be screwed, and stuck with the discontinued 5xxx series.