Genuine question as someone not from the US, wouldn’t that make a significant part of a generation mad at Republicans? Some who might be close to voting age or might even be able to vote already.
Trump isn’t up for re-election, and he’s isn’t interested in the long term performance of the Republican Party (he only became a Republican because that’s the party whose primary he could win).
Both parties are owned by the same oligarchs and security state. The owners don't care who you vote for, the system is a political World Wrestling Federation.