To be fair, the vast majority of the world doesn't care about Bitcoin or Monero.
If you believe Monero will continue to downtrend, why not just use it for transactional privacy and continue saving in Bitcoin?

Cash is great locally but:
Cant send cash instantly to anyone on the planet. 
Cant carry unlimited amounts in your head to avoid confiscation and theft. 
Issuance is centralized.
Inflation is unpredictable.
Difficult to verify authenticity of bills on-the-fly.
No mechanism to verify supply.
Not as easily divisible. Need to carry specific denominations for change.
Can't trustlessly exchange for crypto (no atomic swaps)
Different people can't have simultaneous ownership and control over the same cash (multisig)

no-KYC Bitcoin doesn't make it private. No actions are hidden. Anyone in the world can see what you do, so you're more vulnerable to chain analysis. It does make it kind of anonymous though (hidden identity). Privacy and anonymity are both important to have.