Why? It's now harder and harder for the average person to get hold of a bitcoin. That fewer, richer people are now spending money to get more bitcoins isn't going to reduce the price if those players aren't liquidating their bitcoins.
For "average" users, mining has been prohibitively difficult for a while now. CPU mining has been worthless for years. GPU mining has also been mostly worthless, unless you picked (or happened to already have) one of the few cards that perform well.
So anyway, I think we're at a point where the mining difficulty has little impact on the price. Newcomers are going to buy coins, not mine them.
