Yeah. Considering that FPGA are less likely to die than your GPUs and you got a clear winner. FPGA FTW !
Highly unlikely. GPUs are extremely reliable. They have several temperature monitors and will down-clock when they detect overheating. FPGAs? Nada. If you have any cooling issues (fan stops, etc) with an FPGA it'll fry itself before you know it.
FPGA also are less tolerent of thermal stress (heat). You can get away with a GPU hitting 110C+ for a short period of time. I wouldn't recommend it but it is unlikely you will kill it. An FPGA hitting same temps is toast.
FPGA are precision equipment generally used in industrial or scientific applications by qualified personnel. GPU are used by complete idiots. GPU are engineered to be as idiot proof as technology will allow.
LOL. Priceless.