One limitation of non-team accounts is that you can't easily run multiple accounts on one machine. (It's possible with some hackery involving multiple OS user accounts.) I would hope that Dropbox for Teams makes it easy to run the team account in parallel with a personal Dropbox account.

950GB, for starters

This is inaccurate, isn't it? The whole point of working in teams is to share files. Any file that is being shared with everyone is being counted against everyone's space. At least that's my understanding of how Dropbox works based on sharing a few folders with friends on free accounts.

Yes we initially did that, bought a 50gb account and shared that folder with everyone, but it counts against their free 2Gb shares - so everyone needs their own 50Gb plan