Not sarcastic, curiousity. Why do we need a GPU miner for Primecoin?
FPGA are around the corner for Scrypt coins and ASICS will follow soon after, I am referring to link below:
http://www.cryptoindustries.com/?product=horus-10mhNow GPU miners will have no where to go and will either have to dismantle or find the next coin which is still FPGA or ASICS proof (for the time being).
This in turn will help produce more World records, with much faster computation power and strengthen the network. I assume it will also bring the price of the coins up and motivate wider adaptation.
This seems to be the path all coins take to maturity : CPU -> GPU -> FPGA -> ASIC
Unless you are dealing with a clone, in which case all depends on which stage the clone is made.