There is a great deal in what you say that I heartily agree with, and a few things that I don't. I'm not European, although I do visit annually, so I have no horse in that race.
I would say that you repeat a tired American trope that has been outdated for at least 35 years now. That Europe gets more out of the NATO than America does.
The US gets a great deal out of NATO, arguably all lot more than Europe gets. For a start, the US has 31 permamant military bases across Europe and free access to another 19 hosted by member countries. It doesn't really need to ask permission on how it operates on any of them. It also maintains another 275 smaller units and installations for free. This is not a one-way deal for Europe. For the US, a country that insists on projecting power to influence national policy objectives, the ability to operate like this is incredible. Does it pay rent? No. Does it seek agreement with the host country? No. It bombs first and informs later.
Secondly, wherever possible it forces US military hardware onto European countries by way of 'interoperability'. Those F35s provide jobs for US workers. Same with parts, same bombs and weapon systems. All that hard cash flows back to the US. There is a reason why US administrations bitch and moan about Europe not pulling it's weight on NATO but still won't pull out of the region. It's because the US gets a massive indirect benefit from the deal.
But what does Europe get in return? It's supposed to be security guarantees. But the only country that has triggered NATO's Article Five has been the US following 9/11. Hundreds of Europeans died in defence of what happened in far-off New York. Not that this has been appreciated by Trump.
Lastly, the biggest threat to Europe is Putin. And what has been the US response? Not great. All of Europe has been watching and wondering has all this been worth it. The one reason Europe has been tolerating America taking over much of its foreign policy is for a security trade-off. Now it seems the arrangement is worthless.
I'm not European, but I'm watching events. Nothing dramatic will happen in the short term. Spain cancelled it's F35 contract. European countries have universally increased their defence budgets, not from US pressure, but from the realisation that security is unlikely to arrive from America. Countries have failed to support the US openly. First time since WW2. The whole world turned their back on the stupid Iran war. Things have changed irrevocably. However, they will only visibly change over time. You guys are sleepwalking into isolation.
Let's revisit the subject in 10 years and see how things have turned out?