Nope, plently of people do heavy computing with FPGAs. The speedup between FPGA -> ASIC is not that dramatic. Their real advantage is power draw and ammortized

Nope, plently of people do heavy computing with FPGAs. The speedup between FPGA -> ASIC is not that dramatic. Their real advantage is power draw and ammortized cost. FPGAs also have to initialize when powering up.