Vegas is livid about this. There is no question that Vegas has made itself a destination for gambling and non-gambling, but it's all a big house of cards. Those gigantic places need visitors and sports books were a big draw. How many here have taken trips with their boys to gamble, hit steak houses and gentleman's clubs, etc? Even if you didn't lose in the sports book, you spent a lot on food and other entertainment. Closer legal sports gambling gives you another reason to take that trip elsewhere. Vegas will lose visitors and they now lose leverage. There are other voices in the space. The pro sports leagues have already said they want a cut. The states will all say no, but those leagues have impressive people working for them and someone will come up with a way (either legally or politically) for the leagues to get their cut.
Re weed vs. gambling, I fully believe that if both were made legal, gambling would negatively impact significantly more lives than marijuana. That includes not only the user/gambler, but also the collateral damage. The most chronic pot smoker will still function in life and the product will not be expensive enough to result in destitution and crime. There doesn't seem to be any evidence to believe that legalized pot would change society anymore than alcohol. I believe easier, legal access to gambling will result in lost life savings, crimes to compensate for losses, and eventual return to black market betting. I'm still okay with the legalization.