Yeah, 60% is a lot. Could do with having a dozen "big" players. Unfortunately its a free market, so what to do?
This issue has been already pointed out during last year bitcoin conference.
That's what you get with proof of work and ASICwith an "high" entry barrier.
Core developers should seriously start to think about a way to mitigate 51%
Except that miners have zero incentive to destroy the bitcoin network. Its like cutting off your own head.