Another way to look at Dropbox’s challenges, which you touch on thematically throughout this article, can also be examined through Gartner’s Hype Cycle — Trough of Disillusionment.
“Interest wanes as experiments and implementations fail to deliver. Producers of the technology shake out or fail. Investments continue only if the surviving providers improve their products to the satisfaction of early adopters.”
More about Gartner’s Hype Cycle here: http://www.gartner.com/technology/research/methodologies/hype-cycle.jsp
I believe this applies to many technology companies now, both startups and public companies, experiencing stagnant innovation, growth and access to talent/resources.
Overall, great insights. Perhaps, part two of this article would be suggestions on how to overcome the fallacy? :)