IMHO, if Trump wins in Iowa, then what Cruz said is correct - he’s leading in New Hampshire by a lot, and putting those 2 wins together means that it will be very difficult for anyone (i.e. Cruz himself) to catch him after that. Money and endorsements will dry up, and all of the momentum will be Trump’s.
As for Bush or Rubio being able to stop him, even IF all of the others resign and all of their support goes to that one guy - ha, ha, ha, ha, ha...it’ll never happen. NO ONE who is part of the establishment will win, because 80% of the electorate is sick to death of the establishment (that goes for Dems & Pubbies, but more so for the latter).
Trump is all but the nominee right now. Obama would need to order his plane shot out of the sky to change that.
I agree. Even Ted Cruz himself has said that if Trump wins both Iowa and NH that he will be virtually unstoppable.