Cloudflare has already received NSLs. Once they provide both encrypted DNS and TLS-termination for a good chunk of the internet they'll become a juicy target for the three letter agencies and you might not know about it for years.

If you don't live in the US a local ISP might be a lesser evil and I wonder why mozilla should make that tradeoff for everyone.

Sure, some jurisdictions might be worse than the US and TRR might be a win there. But for some it's worse. So we shouldn't pretend it's a one-size-fits all solution.