My guess is enough states will keep him off the ballot to prevent him from winning and the courts will do nothing as the constitution gives the states control over elections.
Write-in? Election fraud will make sure that isn’t an option.
No, states don't have unlimited control over elections.
The Constitution gives states control over elections within the framework of the Constitution and all the rights protected by the Constitution.
If blue states act to take Trump off the ballot, red states will do the same, throwing us into a Contingent election in the house, where Trump would easily win.