What I mean by "pointless" is that when you LOOSE money by mining.
If mining wasn't profitable for me I'd stop mining (which would reduce the hashrate a tiny amount). If enough miners felt the same then...
Difficulty will be lowered, if hashrate drops.
(This is hypothetical, since I'm no longer a miner - I've stopped twice: once when it was no longer practical to mine with my CPU, and a second time when it was no longer profitable to mine with a GPU.)
ASICs aside, new models of GPUs (videocards) should somehow fix the matters in the long run (since they are not tied with bitcoin, and their performance should increase no matter what). So it should all come to a balance somewhere in the future...