It's playing with fire.
It's right and wrong. Right decision, but it's going to have bad consequences.
It's one thing to have it in Vegas, but potentially every state? Good luck finding people trying to rig stuff.
It'll expand the number of people capable of doing this sort of thing. Any Tom, Dick, or Harry will now potentially have a means to easily rig stuff if they can find a ref, player or coach receptive to them. They don't have to go to Vegas or know someone, they can just potentially head to the stadium itself and place the bet.
Whatever sports leagues embrace this are setting themselves up to kill the golden goose. This really could destroy one of the leagues in the long run. People don't want to pay top dollar and companies might not want to pay top dollar to advertise in a league which they ended up being a part of some rig job.
Of course this can also be bad for players, coaches, refs as now they'll have big targets on their backs. It may take a few years, maybe even a decade or two, but there will be something big out of this eventually, and it easily could cost any league billions, if not tens of billions. Which of course then lowers players salaries/strikes/lockouts.
Hell put this on top of all the other factors dragging down leagues/networks right now and it could also be the straw that breaks the camel's back.