I agree.
Rubio will eventually inherit the Christie and Bush votes and some percentage of all the rest. I see it as Cruz-Trump-Rubio or Trump-Cruz-Rubio going forward. That should be all that is left after March 1 and it should thin down some after the Iowa caucus on Feb 1 and the NH Primary on Feb 9.
With all the talk of a brokered convention and the rule change to allocate delegates proportionally, it’s not very likely that many people will drop out.
Kasich will try to pick up delegates in the Ohio primary, Christie in New Jersey, etc..
This will obviously benefit Trump.