If the cost and number of miners not rises, then inevitable GPU
I could release a gpu miner modifying the phm's sph-sgminer version.
I'd need just two things: an incentive to do it and a recent gpu! The sph-sgminer doesnt work with my ati 4570, because he targeted just more recent video cards. I could adapt his gpuminer and moreover I could fix all to work also with not recent video cards.
But I cannot afford this now, so the easy way is to ask phm to include QubitCoin in his miner.