I'd be one of those people... I have alot of short domain names outside of .mobi and about 50% of my current domain name investments are in names <5 characters. I'll bet on .mobi, I'll bet on LLL.coms, I'll bet on LLLL.coms... No need to pick and choose. Bet on everything and there's no way you can miss out
And in the end, yes, for the time being, good for mobile = good for .mobi
But... Good for mobile = good for LLL.coms, LLLL.coms and all other .coms as well.
It's not just .mobi that stands to gain here if (okay... when) this whole mobile internet thingy actually comes to light...