I still don't understand why people compare two GPUs to one GPU and act like this is somehow an equal comparison.

Why don't you compare two GPUs to two GPUs?? Of course AMD will look better when you compare two to one.

Does AMD have a solution to beat two 280GTX in SLI that I can buy any time soon?

Will two 4870 in crossfire beat two 280GTX in SLI? I seriously doubt it.