You missed the whole gaming market in that. There's also offloading I/O (eg Bittorrent) and audio/video playback or conversion. In business desktops, I could see additional uses like security coprocessor or accelerating analysis of large data sets coded in parallelized R or something. Plenty of use-cases in HPC with them long being consumers of FPGA's, ec. Server farms, esp cloud, are competing on performance per watt with FPGA's being champs in that in certain workloads.

So, I see plenty of opportunities on consumer and business side. I think adoption in consumer space will be quite low like with other high-end equipment.