Short answer - no, GHash.IO hasn't "broken the 50% barrier". I'd be more worried abut the fact it even got to 40% of the network. It tells me that many - maybe most - miners are very short sighted.
Human nature is to be greedy alas. Selflessness is only taught (and by a diminishingly few parents).
You mean "selfLESSness" right?
edit: hmm, you must've edited right before I clicked quote
