Historically, the hospitality industry has been the mainstay of Sullivan County. There is no manufacturing to speak of nor is the much in the way of agriculture. Since the demise of the Borscht Belt, Sullivan county has been an economically depressed area. Casino gambling is simply a modern iteration of Sullivan County’s traditional industry. So the answer to the OP is yes, it will change things sort of back to the way they were.
Is it good for Yidden? Well, if you own property in Sullivan County you’re going to do well. If you’re a compulsive gambler, it may be a little easier to lose your shirt although, remembering the six hour odyssey to get to Grossinger’s back in the day, that might not be so.
Just a note. If any of you do plan on sampling the delights of the new casinos, please don’t go in levush. It’s embarrassing to to see all those bekeshes on the casino floor.