That said, I can see enormous potential in this as an education platform. Having trouble with you CS homework? Open up Nitrous and get someone far away to help you out.
The collaboration feature is still too rough to be useful for a novice level class. Also it gives full access to the collab box with exactly the same permissions as the box owner. If they add some features and some tools for gating access and user privileges it will be useful for my class.
Even with 2 TAs, I can't even imagine the alternative of trying to get an entire class of programming newbies running ruby locally across Mac and Windows without any problems or leaving anyone behind. It's easy as a developer to underestimate the difficulty of getting things set up. Even in nitrous the most common problem I have to debug during class is people not being in the right directory because they have to use 'cd workspace' before they can 'ruby helloworld.rb'. There's just a giant set of knowledge that we developers rely on to even do the simplest of tasks, and nitrous lets me skip over all that boring stuff and get right to the interesting concepts they can see on their screen like paths, params, request handlers, views and links.
My only complaint is the onboarding UX uses some confusing wording/concepts for beginners like "boxes" and "hostnames" and energy credits. I just handhold everyone through that part so it must be really difficult for someone trying to load it up themselves. When I found some bugs I had the chance to talk with the guys behind nitrous and they were really helpful with trying to figure out what went wrong and how they can simplify the flow, so hopefully we'll see some improvements there with the new round of funding.
Also keep in mind that many/most larger organizations don't have a single codebase, so this doesn't apply just to new hires. Everybody at a large organization would by definition be new on most of their code projects.
If a developer is going to work on a project for only two weeks, you're basically throwing away 20% of their time. Alternatively, you don't assign people to short-term projects where they might be able to add value because of the overhead.
Worth noting also: Nitrous works with any local editor and deploys to whatever, so I'm not really sure how there's lock-in.