Right now EU is just in the bent over position and waiting to be fucked. By everyone. And Brussels don't have the vaguest idea how to get out of it.
Currencies are speculative instruments, not reliable measures. If you measure the economy of one entity in the currency of another entity, you should never accept the numbers at face value.
The EU just signed a giant trade deal with Mercosur, creating the world's largest free market.
If the US didn't had the singular role of the USD it would have been in dire trouble a while ago. Now the incentives for keeping the USD are getting less and less.
If Trump was an agent to hurt the US position in the world, he wouldn't do anything differently.