In order for something to attain a higher future value, it must have value to begin with.
Useless LLLL.coms only appeal to 'domain collectors' and people who participate at the absolute lowest level of this game.
To bet that such names will increase in value over time (which is contingent on demand for them increasing) is essentially betting on an exponential growth of 'domainers' and a presumption that the vast majority of them will suck very, very badly at domaining, since those are the only people who buy pointless LLLL.com names for the sake of ownership.
Is this occurance impossible? That the caliber and intelligence level of domainers keeps drifting lower and lower until we hit some random point in the future where every 80 IQ dolt out there is impulsively lighting their McDonalds paychecks on fire to buy 3d names, QXVZ.com and making certain they "get in" on the .forsure landrush? No, this sort of future behavior isn't impossible (since we needn't look any further than the present to see examples of it happening), but the LLLL.com mania is/was based on the absolute dumbest aspects of domain buying and I'd like to think that the community will learn from it's past mistakes and things like this will take their rightful place in the historical dustbin, alongside such domaining mistakes as putting a dash between the E and the keyword, b2b names, and pretty much every first time, newly registered name since 2006 or so.
(none of this is commentary on omfg.com. That's a great name and an example of a LLLL.com name that is NOT useless, however, it's value lies in the meaning inherent to the letters themselves and not the fact that there are only four of them)