Tesla still has a lot of retail stores to open, and five months from now there will be 10 times as many cars on the road and 10 times as many owners telling their friends what their impressions of the car are.
Oh, and the U.S. represents perhaps only a quarter of the global market for luxury cars, while also being a clear trendsetter in global popular culture.
But even setting aside the possibility that Tesla might capture a slice of the global market commesurate with the one they are carving out in the U.S., at current rates Tesla will need to push production to ~500 cars per week just to meet existing demand. With a 15,000 car wait list, a 600 car/week production rate would take almost 3 years to whittle that down to zero (assuming constant global demand of ~26,000/year).
Personally, considering where Tesla is, and where they might go, I'd be looking hard at the investments necessary to double the current production goal of 400 cars per week.