RIP CPU mining.
Not really... there is not so much acceleration right now in GPU. My mid-end 5830 is giving out something like 660kh which is what a i7 laptop will be able to give when a few more hashes get accelerated with AVX/AES.
Yep, but most of miners using r9 280x, about 2MH's per card on current sgminer.
We'll see how it goes, depending the evolution of the GPU and CPU clients. IMO the best solution will probably be a GPGPU combo which combines GPU acceleration for massive parallelization and CPU for operations that are best performed through its extended instruction set (massively accelerated) although that doesn't mean we'll see one.