How many right wingers will be left now support for Trump is crumbling?
Support for Trump is not crumbling. His base still supports him. What is crumbling is the alliance of "right wing" people who never really liked/supported Trump, but were willing to accept him for the alliance. This is enough to turn the next election, but the "right wing" (again, whatever that is...) is still there and mostly hasn't change positions.
Plenty if you're in charge of allocating finite resources. Look up "guns vs butter"
I'm only responding at all in hopes that someone can help me understand the confusion and perhaps explain things in a way you can understand.
Trump's disapproval is all Democrats.
DNC's disapproval is all Republicans plus many/most Democrats (for not opposing Trump hard enough).