Seems like a cool scheme. I get their concerns about drug tourism - hope the dust settles soon as we can see some data on the impact of the club system getting up and running.
I wouldn't mind smoking a joint now and then but under the current scheme, with either club membership or home-growing, I'd have to commit to buying a whole butt-load of weed.
Requiring residency to buy is perfectly sufficient to quell tourism, though I think there should be exceptions for people from countries with legal weed because they're not going to come here to smoke. It doesn't mean out-sourcing the distribution of small amounts to the black market.