People are allergic to any "fork action" of bitcoin. That is why XT failed so miserably, I am not sure if that proposed BIP of yours is not conservative enough for bitcoin purists.
Also I doubt that any changes that will push bitcoin into even more anonymous and private state will ever happen, it will be quite opposite route imo.
I see that not a fee people feared the spread fear about a fork but XT failed because Hearn and his stupid ideas. If it would have not been because of that i'm sure they would find more and more supporters.