Not sure where you get that number. Exactly three months ago (May 9th) we were at 143000. Since we have yet to see 156000, the number is below 4333/month. You also need to exclude some (smallish) ranges that are clearly inventory and I get around 4200/month, at best. Finally, there was an uptick after the release of the 60kWh model but that seems to have died down by now. Maybe it's just summer blues and we will return to see some growth.
Agrees, a 100kWh battery has the potential to unlock demand. At the same time, more and more people are expected AutoPilot 2.0 any day now and especially current top-of-the-line owners may postpone an upgrade even when the 100 is available. Pure speculation but it is very well possible that the 100kWh basically is done but that Tesla won't release it until AP2 hardware is available as well. I believe such a combo has the potential to equal the effect of the release of AWD + AP1 at the end of 2014 which is basically what lifted the Model S from a 35k/year car to a 50k/year car.