I must be missing something but didn't Donnie campaign promise that he would withdraw if elected. Keeping a promise. I like that
Duarte in the Philippine sis keeping his campaign promises as well.
Making promises during a campaign based on emotions and implementing them against the advice from you own security advisers is never a good thing. Upsetting and not listening to your traditional allies is not a good thing either. Mr Trump has managed to do both in 10 minutes.
Being a successful showman and being President of the most powerful country in the planet ( at the moment) are 2 different things.
If the US stop being a reliable partner (in Aviation or else), China will very nicely fill the void and I think the Europeans are likely to follow the new leader.