sigh... lemme tell ya what they taught us in finance theory class: rich investors are not stupider than average investors; in fact, if investing "for the long term" is the right thing to do, rich investors actually have the resources, wherewithal and the time to do it.
The problem is, as hard as it is to predict the future, it is harder to predict farther into the future; and, once you set up a pot of "long term" honey, people have a chance to reorganize their affairs to siphon off said honey and if your idea is to not pay attention to their short term results, you set yourself up for a big long term surprise. Publicly traded companies are mostly companies that have products, markets, customers, service, etc. Generally, when they are losing money compared to other companies, it does not scream "we're pouring money into R&D, great things are around the corner!"
This boils down to, statistically speaking, short term results are actually the best indicator of long term results. You'd be foolish (statistically) to overemphasize long term hypotheticals in the face of short term losses.
TL;DR that financial markets are too tilted in favor of "short term" results is largely a myth. if it were not a myth, wealth would shift from the majority people who supposedly pay attention to short term results and toward people who ignore short term results leading to the end of the myth.
edit (couple above and): I'm not saying that long term projects and ideas and thinking don't ever pay off; I'm saying that saying that they are undervalued and therefore represent an opportunity is a stretch and requires proof that you most likely will not find if you look because others have looked.