Yeah, I hope to still have many of my domains 15 years from now. While there is the chance that a new method of accessing information will come along, I see no sign of it.
My preferance would be .MOBI. Both that and TV are a gamble that a market segment of the internet will, at least partly, embrace the newer TLD . TV is currently very centralized and production costs for content are high. Content is used once and then the user wants something different. Mobile web has need of many more sites than TV, and people order pizza every week. Plus the renewals are cheaper.
But for a long term play I still would (and have) put most of my money on . COM.