All I can do is point to how much power the mob amassed in the US during prohibition, and how long they held that power after prohibition ended. Sure, their revenue took a hit, but they moved fairly smoothly into other areas, and corrupted other power structures in order to build and maintain illicit revenue streams. It wasn’t until the 80s and 90s that the mob families in NYC really saw significant consequences.
As an example? Mozarella cheese on pizza. That was fully controlled by the mob for a long time.