not sure what point you are trying to make here, yes you can win a state with 30 or 40% of a vote when your vote is factured, but realistically Trump and Cruz probably combine on their best days to no more than 55-60% of the electorate, meaning, that if its a 3 way race, the other guys going to get 40-45 % of the vote at least...
If Trump and Cruz fragment that 55-60% of the vote 40/20 then guess what? They both lose more often than either of them win. As long as both are viable, and neither wins any state by 50% solo, the idea that the establishment is dead is a bit premature.
This is politics people, Last Saturday Afternoon Rubio was looking like the sure fire Establishment candidate, and polling at 18%, by tuesday he got 10% and lost to Bush. There is a lot of field left to play, and while I am glad the way the momentum is going... it is foolish to write off the establishment completely after 2 contests.
My point is Trump can win with 30%-40%. Romney did it and that was a smaller field than this year.