I don't really think there is a viable Mafia family in Detroit proper. Much of that functionality has been overtaken by Chaldeans or by the city and county political structure. The former Detroit mayor is on trial for essentially doing a lot of the same things a mob member would have done-kickbacks on contracts, no-show jobs for family and friends, extortion, etc.
I don't know about other areas but it would be interesting if there were a peer reviewed study about the impact of state lotteries on organized crime bookmaking and gambling games. The only people I know that are even aware of where or how to place a bet are much older people. But just about everyone knows where/how to play the lotto.
Michigan in general has lost a lot of people. I think Michigan was among the few or even only state(s) to do since the last census. The entire state of Michigan has fewer people than the NYC metro area. There just may not be the population density to support a vibrant traditional OC family.
The legal lottery certainly cut into the numbers racket, although it didn't complete kill it. People still play the numbers because it typically has better odds and there's no state tax. Legalized gambling as also cut into other forms of gambling, including the mob's high stakes card games and video poker. You don't hear about the old back room casinos much anymore since legal gambling is so prevalent around the country.
The one exception is sports betting. For the mob, that's going as strong as ever and really is their bread and butter. They still control the lion's share of the business in areas where the mob still has a presence. The mob caters to the typical sports betting clientele - whites. And it controls a lot of the offshore phone banks and websites.
As for the Chaldeans in Detroit, the LCN there has a long standing relationship with them; at least as far as gambling operations go. But like I said, it's basically down to the basic sports betting and loansharking at this point. Those are the two standard illegal rackets that are usually the last to go after everything else.
