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.)