Ask yourself what use you have for an FPGA on the desktop that you couldn't use the GPU for. Fact is, your desktop will include a GPU anyways. So that FPGA will

Ask yourself what use you have for an FPGA on the desktop that you couldn't use the GPU for. Fact is, your desktop will include a GPU anyways. So that FPGA will not be in lieu of but rather in addition to. So this will only change when either of a couple things happen. One is demand side: a killer application on the desktop which requires an FPGA comes along and drives demand. The other is supply side: the demand for CPU+FPGA is so great from Amazon+Microsoft+Google that chip manufacturers just supply it in desktops for 'nothing'. An example of the demand side is game graphics. I don't need this but a lot of people do and then my UI graphics get better. An example of the supply side is that I don't really need cryptographic grade random number seeds, RDSEED, but I get it for free because someone who buys a ton more than I do does need this. I don't see this happening for 5-10 years.