I don't completely buy the "Osborne Effect" argument...
Apologies in advance for long post. The Osborne Effect argument is very real IMO. Here is why they are doing
absolutely nothing to publicize Model X (apart from their spartan Model X web page), and even, increasing incentives to prospective buyers to choose Model S instead.
Tesla have a cashflow plan, and they have to keep a
very close eye on cashflow. If they go all out publicizing the Model X (and this could be done very effectively for relatively little money), reservations will go through the roof. At the same time, people who were possibly going to buy a Model S will not
buy one... they'll just keep what they've got and wait for their Model X to be produced in 2016.
As you may know Tesla currently sink a lot of the profits they make from current Model S sales into 1) Gigafactory, 2) Model 3 design, 3) Model X production ramp-up, 4) Supercharger installation. This causes the massive profit they make to vaporize and be replaced by that small GAAP loss each quarter.
Tesla have to very carefully manage the income from Model S sales and the expenditures on these other things. It's a delicate balance.
It the all-singing, all-dancing Model X rushes in, guns a-blazing and shouting "Leeroy Jenkins!!!" (gamers' reference), it would surely dent the income from Model S sales. Confirmed Model S reservation holders who are waiting that relatively short amount of time for their car to show up, might cancel, losing their $2500 deposit, but reserving a Model X, and in doing so, Tesla would
not get the very large balance of the car price that's needed to meet the cashflow plan.
Also, if you visit the factory right now, you'll see Tesla has a very highly-trained workforce producing lots of Model S cars each week, highly profitably. Model X on the other hand is being produced very slowly and will not generate bags and bags of profit for a while - even if the high-priced Signature cars are first off the line. It would be very dumb to focus on Model X too early.
And, If production of Model X until "early 2016" is fully all reserved, no publicity is needed until then. Early customers' cars will produce the "guarantee" that later reservation holders need to stick around. This timespan probably fits nicely with the production ramp needed to turn Model X into the cash cow we all know it can be. After that, they can turn the heat off Model S.
Lastly, the risk of encountering the Osborne Effect isn't limited to Tesla. Leaf and Volt sales are down, and have been down for a while, and the reason for both is broadly judged to be the arrival of next-generation cars which has been on the horizon for a while. That right there is a living breathing demonstration of the Osborne Effect.