I would personally be supportive of releasing pretty much everything as Open Source, such as the Control Panel and server code. It would probably need to be scrubbed first of certain things that are covered by contract (ie API keys, etc.) but in principle it's quite possible.
There is actually only one piece of code in the device that Chumby cannot theoretically release source code for, and that's the Adobe Flash Lite Player.
However, the only people that can authorize a source code release are the Chumby trustees. I don't have that authority - at this point, I'm not very different than you in terms of rights, since I'm no longer an employee.
The stuff I (and a few other people) have been doing for the last few months has been purely maintenance of the assets to the status quo - I cannot do anything that materially changes them without permission.
In other words, I've been simply continuing, to the best of my ability, what Chumby would have normally been doing at the time the trustees took control - helping users with problems with their accounts, registering and deregistering devices, etc. Not all support emails have gone unanswered - things I *can* do I've done.
There are normal operating functions that I *can't* do - for instance, I have no access to the inventory of devices, so folks with apparently bad power supplies or SD cards (the vast bulk of the "physical" problems people are having, but fortunately not the larger fraction of total problems) are not supportable by me.
Things like releasing more source code is something I *can't* do, as much as I'd like to, since I don't own it except for my own 50 or so widgets.
We do have a plan for a peer-to-peer version of the Chumby ecosystem, that would allow the propagation of widgets without any dependency upon the back end services - sort of like zurk's system but more sophisticated in that authors could still publish widgets and users could manage them from their devices. That actually is something we could do *without* Chumby's permission, as zurk has done - but it's a matter of finding the time to do it.