One might also point out that after about 2:00 p.m. yesterday, Donald Trump's value to the Republican Party dropped very substantially.  For most of the Republican caucus, Mike Pence would be a much more desirable option.  

Donald Trump is a seventy year old man who is overweight, who gets little exercise and is not known for having a healthy diet.
He is the man-of-a-thousand-lawsuits.
He has an inventory of potential conflicts-of-interest as long as your arm.

Mike Pence is one impeachment away from the Oval Office.