I strongly recommend Autodesk to consider a hybrid open-source/commercial scheme for Robot, in a similar way to what Apple does with MacOS.
For example, you could make Robot open-source, but provide support in a commercial basis (NOTE: most of the complaints I've heard about Robot is about the lack of proper support that can answer deep technical questions, so I'm sure lots of engineering firms would pay for having deep technical support that can help them).
If Robot was open-source, many of us would be willing to volunteer in adding support for more international standards, or in porting it to other operating systems (I'd be one willing to do this, with decades of experience in C/C++ development for in-house engineering tools).
I don't think Robot should grow in size. On the opposite, I believe the interface should even be minimized to a cleaner concept. The sad thing is that people are used to see monster-sized horrendous user interfaces in the big applications nowadays, so commercial brands are into the mindset of "let's add more things to the UI for the next version, and let's make the additions very noticeable". Maybe that's good for selling licences, but it's very bad for the quality of the software (I'm not saying the Robot UI is increasing version by version --it's not, but however, some things should be simplified: The RC modules UI is just untidy).
Please consider open-sourcing it. Otherwise, seeing it disappear would be too sad.