I Agree with you.
Just to add one way crypto could and may already be disrupt at will:

World-wild networking has chokepoints (both end of submarine cable).
These chokepoint are own by big corroration that will obey any high level demands.
Crypto traffic can be identified on the fly and be denied. Then by denying traffic you kill any targeted crypto at will.

I see that senario happening with very high chance for any crypto that would be harder to control. (ie XMR)