This is a worry for sure.
Drug Dealing seems to be the main (some would say only viable option) source of illegal income for most criminals and gangs.
It probably creates the most rp and interactions between all the criminals and Gangs in the city:
Large gangs importing the drugs and making deals with mid level gangs and controlling turfs and forcing taxes.
Mid level gangs seeking the large gangs out to make deals and acting as wholesalers and seeking smaller gangs or solo dealers for customers.
Small gangs, solo crims or new crims looking for their supply of drugs to sell on the Large gangs turf.
The drug trade brings all levels of crims together in different ways, there is a fluctuating and competitive market for Sellers and buyers, rivalries and wars created and all this would cease if the Drug trade was no longer profitable and lucrative.
Would hate for a trend that's occurring to become the norm, supposed crims/gangs turning into fulltime/permanent taxi drivers.