I suspect they will go all in around Cruz, try to take it to broken and see if Trump's lead can be whittled down and that his plurality doesn't translate to a majority.
If Rubio does FL, he loses.
If Rubio doesn't quit before FL. Based on MI, Kasich loses Ohio.
I suppose that is a second option.
Get Rubio out before Florida and hope Kasich can take the mid west and then coalesce around Cruz on a Cruz-Kasich ticket?
Be interesting if they can pull it off on Trump losing from here. Cruz is incredibly unlikeable on a personal level.