Why, out of interest? They can only get them out as quickly as Fuji can make and distribute them, so as long as each retailer is supplying them earliest order first, that's all they can do really. Having a moan (hopefully) won't bump anyone up the list at the expense of others.
Either way it's great for the Fuji X system as a whole that over 2 months from the first shipments they still haven't got to the point where stock is generally available. A profitable, well established system should mean plenty more developments in the future. Considering the X-T10 was absolutely huge for them, I can only imagine how popular the X-T20 is going to be.