The time to build adversarially is now, not the moment those conditions surface.

Unless Bitcoin hardforks (wont happen, immutability is a core value prop for btc), privacy enhancements are only possible with crucial tradeoffs that come with higher layers (such as custody, security, or centralization).

Monero is already the #1 privacy coin (network effects often used as a bitcoin maxi argument) it will be next to impossible to dethrone. There will always be a major use case for Monero it just depends on what you prioritize.