What Mr. Puljic is hinting at is a separate Croat entity (hence "the same rights as Muslims and Serbs"). They should've thought of this and similar issues before ganging up on the Serbs in 1992.
It is up to the imperial overlords in Bosnia to allow the Croats their own province/region/whatever to come into existence and the Serbs have nothing to do with that.
Yes, I noticed that the Serbs have no power in that part of Bosnia. Well, looks like the RC may to all move to the Catholic country of Croatia which is almost Serb and muslim free.