Now, you might offset that by having MORE cannabis business revenue nationally, instead of just in the legalized states, but don't think the IRS isn't getting their piece of the pie already....
Regardless of what states have done, without Federal legalization, marijuana businesses are cut off from most financial products provided by the "mainstream" financial institutions, including aid from the Federal Government during emergencies (e.g. the current pandemic). So this step would be quite impactful.
When Oregon first started its recreational program in 2016, they collected about $20M in taxes [1]. In 2020, it was $133M. Other states are similar. It has a lot to do with $$$, it always does. Politicians sell ideas using emotions, but we have to dig deeper.
[1] https://www.oregon.gov/DOR/programs/gov-research/Documents/F...
They tried to declare dispensaries and liquor stores non-essential in CO, and the run on stores caused a couple super spreader events within hours before they reversed their decision. A brewery near by made some awesome glasses that say "Denver Prohibition 3/23/2020 3PM - 3/23/2020 5PM Never Forget".