It would be nice if he provide some example about how to implement, the privacy in the protocol. We have coins that already did it like monero and zcash, but maybe there are other ways to do this. But the problem is how big this change would be to bitcoin, it would hit the point where the coins is not bitcoin anymore, it will look like a totally different coin.

At this point, the governments are involved into bitcoin, and a change like this will not like them at all, this could make some governments like El Salvador, decide to stop using bitcoin and move to another coin like LTC.