Great comment, thank you. I'd just like to add that the "frunk" isn't new -- I've been stashing my gym bag in my Porsche 911's frunk for years (it's a rear-engined car).
Edit: While I absolutely live the Model S, I can assure you that exceeding stalwarts of the 5-series category, like the BMW M5, will not be as easy to disrupt as the market the Model S aims for.