Why not? All online marketplace in my country are full of propositions of constructing GPUmining farm. And, as I can see, it is very popular service. Persons don't want to risk and buy ASICs. Gamers would buy your GPUs with great pleasure, but what about ASICs.
I know that can earn more with ASICs, but if there will be panic on market, it would be hard to sell hardware...
Not to speak for the poster, but my two cents: I read that as in reference to specific coins, that if ASIC mining is available for that coin then it is the way to go because a current ASIC chip geared for a specific coin will outperform a current GPU on that same coin, pretty much always, that's what it's designed to do. For general mining, you can still profit significantly with gpus though (look at the profits from the D3 vs 4 580s, but also look at 5 580s vs an L3+; it's all relative).