Bitcoin sidechains make way more sense than adding exchange & price volatility risk to make a private transaction. It doesn't really make sense to use Monero at all.

Monetary network effects are very unforgiving & I think this will beasically be a "winner takes all" sort of competition.

Unquestionable supply auditablity is more important than perfect privacy.

Stealth addresses & sidechains networked via lightning & other minor improvements will continue to compound bitcoin's privacy potential a little bit at a time. Something like CISA that improves efficiency in terms of on chain footprint while also improving privacy would be ideal.