At what point does it become pointless to use our GPUs?
If the current n-factor gives me 120/150 KH/s for my 280Xs/290, the next will be be 60/75 and then 30/38. I will still be able to mine the same number of coins with these hash rates? Just trying to figure out how long my 4 280Xs and one 290 have got with this coin/scrypt.
You will still get as much coins as u do now, unless ultracoin gains popularity and attracts more miners.
But after a few more N factor increasese, it will be more cost effective to CPU mine this coin.
If there is a CPU miner by then ofcourse...