What exactly happened? The 2-3 giant mining operations who accounted for a majority of GHash's power dispersed into different mining pools so as to camouflage their actual share of the network and give the appearance of decentralization?
Are you suggesting protocol level changes to combat this? Economies of scale guarantee there will be a relative level of centralization in mining.
I'm not. Too be fair I'm not too concerned with miners centralization but it's another thing to pretend that things are all jolly and there's no consolidation going on behind the scenes.
if the miners go rogue or gets too much power in a disruptive way, trust in the network will dissipate and everybody looses..
and especially them who has spend millions building top notch infrastructures.