Well, aren't there 9 members now? So all it would take is 4 of them to block a vote. I think probably Losch, Herd and Lett are all old school. If they were the only ones blocking things, then, yes, they can have their 6 votes which is two thirds now that Tony is gone.
Not sure about Jackson. Is he hard, soft or in between?
But then again, hasn't there been some gobbledygook about the Governing Body trying to vote things through unanimously and if not, they put it aside and discuss it more?
I guess maybe those that make the rules can break the rules and remake the rules, so are they really adhering to the two thirds rule at all now?