I think they are really blowing it by making the stores government owned.
In Colorado, the stores are privately owned but very, very strictly regulated. Plants are tracked with an RFID all the way to the products derived from them, with a full chain of custody all the way to purchase.
Only adults 21 and up can enter them, with a strict dual-check of identification (once to enter, and again when paying the cashier).
The various shops actually end up being very different from each other in surprising ways. They all adhere to the regulations, but some are much larger and more corporate feeling, with lower prices, while others are boutique, specialize in higher quality product, and priced higher.
The pace with which new products can be introduced is much faster due to potential producers not having to negotiate with a giant bureaucracy to get a product on the shelves.