Let me raise the licensing question once again.
On the one hand, I do understand that an enormous amount of effort has been put into developing the engine and that the developers surely want to be fairly well paid for the job they already did and that still do. And, on the other hand, I cannot disagree with the topic starter that open source projects have a much better chances for faster development and very long time survival. This brings me to my humble suggestion to consider licensing schemes that would allow both commercial and non-commercial use at the same time.
In particular, I would point a finger at Qt framework and its dual licensing scheme: a commercial license to develop closed-source software including support and a set of extra features and a royalty-free open source license (LGPL) for open source developers. This project (Qt) lived a long life until now with this scheme and gained enough profit to keep evolving into one of the best frameworks we can find today. And it still keeps doing things fairly well.
In my opinion, a dual- or multiple-licensing scheme is a good way to go for the Outerra project.