US drug control agency will move to reclassify marijuana

I really don't think this is a positive in any way, unless you oppose recreational marijuana usage.

Making it a schedule III puts it back in "Doctor prescription" territory, and since there's now a legal route to getting it, a lot of these businesses that have operated with impunity are breaking a different set of laws if it's schedule III. No doubt that laws and decriminalization statutes would need to be updated to comply federally. Banks may be able to be used, but only if you're a registered pharmacy. It's really just a lot more questions and a lot more people to profit on the chain to selling it.

Most of the world still treats it as an illegal substance. In the US we have definitely allowed popular sentiment to make it appear much less harmful than it is. I'm not sure it belongs in schedule I, but it certainly doesn't belong OTC.

You seem to believe that a move from Schedule I (totally illegal to sell) to Schedule III (legal to sell under some circumstances) is going to hit the reset button on state laws around cannabis. That seems unlikely, the states are already ignoring the feds on this, this is just a step the feds are taking to bring the federal legal landscape closer to the state landscape. The major changes will simply be, as others have stated, to make it possible to travel with cannabis (with an Rx) and for dispensaries and others to use FDIC insured banking and transfer mechanisms.

Other than that, nothing is likely to change unless states walk back the laws they've already passed.

Remember, it's already illegal on the federal level for these businesses to exist, and that isn't stopping them.