Admittedly the probability of your scenario occurring is not zero, maybe partial misinformation maybe not. Who can you trust on the internet anyway.
For this exercise let's assume this as a fact: New notes are imminent.
This being fact does not negate the utility of a cryptographically secure, fixed supply, immutable record of information exchange for a host of reasons other than the money supply of one country containing 1/20th of the world's population.
Like you, I hypothesize that shitcoins will have their day at the gallows. Where we diverge in hypotheses is that I believe Bitcoin scaled will proceed to satisfy every one of the host of reasons I alluded to above, whether its considered "money" or "cryptocurrency" or not. It will have value due to its use, not as a speculator's casino.