An invasion threat isn't easily forgotten. Eventually things will be ok but America will have to prove itself again. Trust comes on foot and leaves on horseback.
Even if Trump is replaced by a Democrat, the conditions that made Trump happen are still there. That won't change from one day to the next. And don't forget he already happened twice.
10-20 years of decent administrations will make things ok again. But of course our economies will be much more decoupled by then. That process has been set in motion now and won't easily stop. That can start going the other way again but things will have to meaningfully change then over time.
As for Hungary I still don't trust them as far as I can throw them. I would have been happy to bump them back to candidate EU member during the Orban reign and let them prove themselves. Don't forget this Magyar guy is still super conservative. Just less anti EU. But unfortunately EU law didn't provide for the ability to throw a country out. That was a huge oversight.
You are right of course. Germany eventually rebuilt trust within Europe, but now have a highly decoupled economy from their neighbors. As you correctly point out.