Funny how people want to centralize every aspect of Bitcoin. I say if these mining centers are profitable at $40 per BTC, I hope the price falls to $20 per BTC. This type of centralization to enrich the pockets of a few is exactly what Bitcoin is against. I'm constantly surprised by people's willingness to kill what they love in the name of greed.
What percentage of the network do you think these guys can host? Looking at the pics, I would guess no more than a few percent, if that.
Is that "centralization" ? IMO thats no more centralization than the fact a similar (or actually, higher) percentage of the network might -by pure chance- have been powered by the same electricity provider or ISP 4 years ago.