Even if you would prefer the CPL be the only men’s league operating in Canada and MLS to be US only, pulling out of Vancouver by moving the franchise to Vegas would do a lot of harm for the Canadian players at the academy level until the CPL can get their academy system up and running:

Perhaps the Whitecaps leaving the city would force the CPL to invest more heavily in the Vancouver area. That could include expanding into the metro Vancouver area and expediting academy plans. If the worst-case scenario unfolds for the Whitecaps, there is an opportunity for the CPL; however, picking up where the Whitecaps left off would be a considerable and heavy lift for a league playing just its eighth season.