1. Don't the families have crews in Florida? How is Upstate NY or NE PA any different?
2. I'm not talking about bashing people. Chicago is running their gambling rackets without making too much noise. The Indian casinos don't take sports bets.
3. There's more guys in NY than needed to run gambling operations there.
4. I'm not talking about sending top earners.
5. Non-Italians gamble too. The NY families has always used Non-Italian associates too. KC still has gambling. Dallas has gambling. New Orleans has gambling.
The families expanded to Florida, where there is no established Italian community. The Gambinos even opened a club in Atlanta and made money.
For the most part, for all the reasons listed above, you just don't see the remaining mob families venturing beyond their traditional territories. The only significant exceptions are the New York families operating in South Florida and the mob's bookmaking networks reaching across various states and offshore. There's some ad-hoc stuff here and there, like the Gold Club case in Atlanta you mentioned, but that's the exception to the rule.
