Monero is essentially only useful on the black market in USA. It’s also hard to turn back into cash if needed many exchanges won’t accept it. There are ways around KYC and tracking for bitcoin such as mixing. The fact that it isn’t the superior store of value also makes it less likely to be adopted in the future. Also in a P2P market if everyone in KYCd and spending bitcoin then nobody is. I don’t see a future where multiple coins are used for different purposes this sounds convoluted.