I'm hoping it's a big hit just for Tesla's sake. Crossover/Mini-Suv cars are popular, though one of the big points with SUVs was room compared to sedans, but the Model S has a lot of room, so I'm curious what else the X will have as a selling point since room isn't a big gain over the S. Disclaimer: I dislike SUV's, so my perspective isn't coming from one of a innate enthusiasm so my interest is mostly just that of a Tesla supporter.
More headroom and a higher riding position also factor into things.