These things take time, as I mentioned there is work done on more decentralized versions of CoinJoins. And using honest coordinators still provides some adequate privacy even today.

The thing about supply predictability is that it also depends on the ability of anyone (including core devs) making big changes to the protocol. Bitcoin in that regards is still the safest cryptocurrency out there.

Also when it comes to money and SoV, the winner takes all. That's why even though gold is the second best form of money/asset after Bitcoin, it is still inferior to it (in part because of the ever increasing supply).