Not only does Morgan Stanley expect the Model X to do well against other vehicles in its class, it's expecting the new SUV to even outpace the critically acclaimed Model S, with the X accounting for a larger share of sales by the end of 2016. The sales boost provided by the Model X should also contribute to a healthy jump in Tesla's current $250 stock price. MS is expecting Tesla shares to hit about $320, and has called it a "top pick in US autos," according to The Los Angeles Times.
As for how Morgan Stanley is expecting such strong results for a car that literally no one outside of Tesla has driven, it cites Elon Musk's company's increased access to both money and technological expertise relative to the Model S project. The firm also points to Tesla's larger investments in the Model X project so far.