@Golden Fleece the idea you pasted makes sense if people only transact real goods and services in fiat currency. The on and off ramps would then be the barrier between crypto and real-world transactions.
However, people are using crypto for cross border payments. People are buying apartments, villas, fine art, fines wines, etc. with crypto. Cryptocurrency is no longer the world of "Bitcoin pizza" or "can you buy a coffee with Bitcoin" that the media push.
There are real threats to crypto (and other media of exchange) in Western countries, particularly in the form of a Washington-Brussels alliance to try to re-assert the hegemony of their currencies. But fiat off-ramps do not in themselves represent the limit of crypto adoption.