Agreed. File sharing is the type of thing where you can't just rely on first-mover-advantage. Google has the ability and infrastructure to offer more space for free on more devices and platforms.
Dropbox was not the first mover [1]. In fact, their entrance into the market for cloud storage/sync is in a way analogous to Google's entrance into search.
You're second point sounds right. But to me, Dropbox has always been about the UX and convenience rather than the cost / space.
I think it will be interesting to see what Google launches.
I WISH I could remember who said it, but I applies here and in so many other areas: You must offer the consumer something MUCH better than what they already have to get them to switch from something they like. Google Maps dis this when Mapquest was the standard.
I agree with what you wrote mostly.
What dropbox could do to mess up and give Google a chance to do something much better is this: don't give people more free space when the average user struggles with the 2GB limit.
One of the things that made gmail a success was that hotmail and the rest cheaper out on space. People had to constantly clean up their 2MB mailboxes. Google might be able to do the same again if dropbox don't offer more space for free. But that would take away from their earnings, so it isn't an easy problem to solve.
File sharing is the type of thing where you can't just rely on first-mover-advantage.
Yes, especially in a market where there are many, many users of computers who might have occasion to share files who have not used (or even heard of) any of the available file-sharing solutions yet. I am a sporadic user of Dropbox strictly for back-up of documents I produce, and a moderately frequent user of Google Docs for collaborative editing who knows a lot of other Google Docs users. I could see Google making huge gains in market share, turning it into tomorrow's "first mover" from the point of view of most users, for a file-sharing service.
I didn't get why Dropbox was so popular when I was using it the same way you are right now. Okay, it's a convenient way to make backups, but so what?
Then I started using it for sharing. Man, it's magic - I've never had it be so painless to share things. I can put a folder in my dropbox, share it to a few emails, and then everyone just has it later in the day. Man, that's cool. I can also create unlimited of those folders easily to control who gets what documents/files. It's a bloody miracle, Dropbox is. The backup feature is really second fiddle to sharing, it's just to make it useful enough for you to try it before you need to share, so that you discover sharing and fall in love with the product.