As a long term hereditary glaucoma treatment, MJ isn't as effective as drops.
The great majority of decriminalization proponents that I come across are in it so that they can get high. I am not saying that there are not a great many good things (or is that a good many great things?) both medical and non that are good about hemp/cannibis/pot. It's just that I see a lot more Phishheads than community leaders espousing it's virtues. It's really just a matter of marketing, and the right spokesperson (joke).