Earlier quoted context omitted.
This. The very obvious thing in the $10 terabyte offer is, Google wants Dropbox and all data hosters out of business. So I trust that Dropbox _will_ be out of business very soon.
Why? Just because Google are going cheap? I'm personally not interested because it's Google. This may surprise many of you, but there are quite a lot of people who simply don trust Google.
Google's advantage is that they can slowly eat away at Dropbox's market share by integrating Google Drive with and marketing it through their other products.
Dropbox's advantage is their existing customer base.
In time I think Google's got the upper hand on this one.