Leppert may be against it but you can never rule out the crazies in the Dallas City Council!
I believe there is support for a boycott, but not enough. Leppert is a RINO (IMHO) and if there were even mild support for the measure he would be on board.
Dallas City Council consists of a bunch of complete idiots mostly leftists. A bunch of them just went to prison for trying to extort money from white developers. Leppert seems to be a reasonable man.