It's not dumb you're just a little ignorant of the advantages of having dedicated hardware for an FPGA but it reminds me of "would you download a car?" :) . You can emulate an FPGA on the arduino (a really small fpga) but it would be so slow that it would be useless. Imagine simulating a Video Card on your PC, it can be done, but it would be 1000-100000x (more?) slower than the actual GPU.