I doubt it will happen, though I doubted medical marijuana too... It should already be legal, its just a plant, but its hard for me to imagine how the world would be if it was legalized.
Either way people will smoke it, so I guess for the sake of peoples safety (reduced gang crime/shit weed) convenience and your human right to take what you want, it should be legal.
If the politicians were getting high, I could definitely see some great things happening, unless of course they're too baked and start wars with all neighbouring countries due to paranoia...