Whether tablets get as powerful as PCs will dictate whether they will consume the market there, and even then the more space and.power you have, the larger volume you have for using more powerful resources. I think to that end, PCs will have a place simply because of the time vs size of code vs complexity makes the desire for speed of operations want workstations/PC. I think casual PC use will and has declined for ease of use with tablets as users are no longer tied to their desks. Will workstations migrate to the same architecture as tablets? That will depend if x86_64 stops innovating and other architectures keep innovating. I think before having these sort of conversations we have to be clear at what it is we are attempting to state.