It is crunch time for his opponents. To have a chance, they need to reduce it to a two man race immediately. Here’s the math. Trump has 35% nationally. He only needs 25% of the 65% that his opponents garner.
If everyone but Rubio drops out, do you believe Trump can’t get 25% of the rest? Same with Cruz.
Super Tuesday is coming up. About 20% of the delegates are up for grabs in winner-takes-all or winner-takes-most primaries. If the field stays as it is now, Trump could win 80% of them. Then he’ll need even less of that 65% slice to win.
The only chance for Rubio or Cruz is for one or the other to drop before Super Tuesday.