There will always be an on ramp to find. Some games allow you to use Fiat to purchase nfts or digital assets that can be turned into NFTs. These can then be turned into Crypto fairly easily.

Of course many 3rd world countries allow converting fiat so moving there could be worth while for crypto enthusiasts. It all depends how far the major countries such as USA, China, etc want to fall by fighting against crypto.

Naturally I doubt things will get that bad, it will merely be chaotic as regulations go into effect.

As for off ramps well I can pay for HBO, Hulu and several others using Crypto no off ramp needed.