Certain things can’t reasonably be accelerated. Factories have a maximum output and building new ones (with all the infrastructure they need) isn’t instantaneous. Armies need to be trained to different standards. And all of that stuff costs money.
For example: Germany just took on half a trillion Euros in debt to raise “special assets”, that’s equal to 1/9 of our GDP. Those special assets will be used to overhaul our infrastructure (which has been rotting away during two decades of austerity politics) and to get our armed forces into fighting shape. Both of that is required for effective defense production.
But we can’t just tell KDNS to deliver 1000 Leopard 2A8s by the end of the week. Those need to be built. If we want them to be built faster we have to build or refit factories – which we’re actually doing; there are plans to use a Volkswagen plant to build tanks instead of cars. But even if we can build more tanks that won’t do us any good if we can’t manufacture enough shells, have enough tank crews, have the infrastructure to move everything around etc. etc. etc.
The pax americana has always been built on the premise that the USA provide military capabilities to their allies specifically so that the allies won’t compete with them on that stage. Going from that to having to be able to potentially defend against the States in a very short time is a logistical nightmare. In the case of Germany, this comes on top of our infrastructure being shit because the conservatives have spent two decades demonstrating the full depth of their economic ineptitude.
For the time being, the best we have is the fact that the EU is also a military alliance and that France has enough nukes to glass all American metropolitan areas.
These protests don’t really affect Trump directly but they do signal to the local governments that this is something people feel strongly about – and thus something that might cost them votes if they mishandle it. And that might affect how the EU deals with him.