Asic resistant coins are all well and good but how do you protect the coin from large mining farms?
Now there are many gpu mining farms and more being created as the gpu mining is becoming profitable.

Who is to say that, BitMain or any other ASIC manufacturers won't build new asics aimed at mining GPU algos?

I think the only reason they haven't done so yet is due to the extremely low prices when compared to SHA256, Scrypt and X11.