It's sort of ironic now, though, because Dropbox has not been doing very well the last few years, because their product wasn't novel enough to compete with the better-integrated solutions from Microsoft, Apple, and Google that Dropbox inspired
Yes, but not for the reasons that famous comment thought it wouldn't (people ...trivially rolling their own with Linux+FTP+SVN or whatever). If anything, for the opposite reasons: because even more turnkey/integrated solutions than Dropbox became available as you say. Which makes that comment appear even more off now!
(Of course the point of that comment was already obliterated when Dropbox turned on to become a multi-billion worth company, even if it's "not doing very well" 15+ years after the comment was made. We could only wish we have that kind of "failure"!).
1) Its feature-set is easily duplicated (from a technical perspective)
2) It doesn't solve one particular use-case (that it wasn't designed to solve)
3) It's hard to imagine it catching on, let alone making money
Point #1 was widely mocked after Dropbox caught on, but turned out to be kind of correct - it just wasn't end-users that mimicked its feature-set, it was other companies.
Point #2 is irrelevant.
Point #3 was hilariously wrong. It went viral as hell, and the founders could've rode off into the sunset with a boatload of cash if they sold the company to Apple when they were approached. In the alternate universe where that happened, Apple devices just have a Dropbox feature instead of iCloud, a la Siri and Shazam.
Whether it could be duplicated by other companies (with billions in the bank and thousands of engineers and OS/device access for integration) is irrelevant to the original comment's point.
It's become something of a symbol for how hackernews commenters sometimes confidently miss the appeal of products/services. It's relevant here because the Push 3 doesn't compete with iPads on processing power.
Edit: it looks like a few other folks responded with a similar comment as I did. Sorry to spam you.
> No wireless. Less space than a nomad. Lame.
(iPod launch, CmdrTaco, /. 2001)
(Though I'd prefer Galileo in the top spot instead of Columbus; if anything Columbus could replace Bozo: the people that laughed at him were actually completely right, not failing to recognize his genius.)