The feds will still go after it as an illegal drug when presented as recreational and the will keep the stigma going on forever. Furthermore it will keep a lot of talented people out of good job opportunities for smoking a joint after work instead of having a glass of wine.
The only reason cannabis is Schedule I is to “felonize” people who are more likely to vote against Republicans, so their right to vote can be taken away. Pharmceutical companies would frankly love for it to be descheduled, so they can research and develop it for prescription uses.