I wouldn’t ditch NATO....I’d just go and remove 95-percent of the forces from Europe. Ask them to support a deployment type exercise once a year, and deliver 50,000 US troops for that exercise.
Just move our troops out of Germany lock, stock and barrel. Move them to Poland, Hungary and the Baltic states.
We used to call that REFORGER.
We do NOT want to induce Germany to feel it can or must build a strong military.There is a good reason America has taken on the role of European defender and allowed those countries, specifically Germany, a free defense ride.