You think three-fourths (38) of the States would ratify a repeal of the Second Amendment? I don't you could get 38 ratifications for any attempt to repeal or otherwise diminish any part of the Bill of Rights.
Strictly from an academic exercise, what would you be willing to give up in order to get what you wanted in a new or modified constitution? For example, to abolish abortion as a “right” would you give up free speech on the internet? How about adding term limits on Congress and the SCOTUS. Would you or anyone else compromise away the 2nd amendment. I can’t guarantee that something won’t happen in the future that will turn a majority against the conservative reading of the 2nd or any other of the BoR.