Lol, so much wishful thinking here. The adoption of new gtld's is literally occurring in front of our eyes, right now - today. If you're in denial, odds are you're a dinosaur, heavily invested in .com, adverse to change, or incredibly closed-minded.
Will .com remain the single most valuable extension overall, for decades to come? If you ask me, sure. But the demand for, and necessity of owning ".com" will be gradually diminished by the new gtld's. Unless you have truly incredible .com's, they're generally only going to get harder to sell from here on out, and of course that's got a lot of domainers biting their nails.
I know many of ya'll will dismiss my post as nonsense, but it might be wise to consider the opinion of a 20-something youngin' who's been buying and selling .COM's for nearly half his life. I am a .COM guy. But I'm also a realist, and the writing's on the wall, folks.