Personally, I don't want them to make anything noteworthy. I want them to make something subtle, unobtrusive, and as reliable as gravity. I've been using them 3 or 4 years now and as far as I'm concerned, they're my favorite vendor.

Google and Amazon keep screwing with things because they have a complicated global-dominance ecosystem that they're trying to build. I don't trust them with my files. But Dropbox keeps doing what they're doing with only modest, incremental improvements (that gradually add up). As long as they keep things solid, I'll keep using and recommending them.