Taking over the viewer is a different matter. Katharine has current authority on it and I have no interest in doing a coup d'etat to take the domain away, build servers, automated systems systems, content distribution network etc. to give to someone else. Nor would I even give such resources to parties I don't trust. They would need to build and pay for their own infrastructure if they wish to mirror EV (all of which was and is paid for out of my own pocket).
The problem with Firestorm is that it's like a Katamari. Whenever a developer creates a new viewer with new unique features, their developers look to absorb all the 'cool features' into their viewer and that viewer will never be able to compete because the amount of development effort to do something from scratch, new and proper is a lot more significant than just copying features across. This decensitivises developers from continuing their projects. The reason why Exodus Viewer somewhat persisted is that our features were not so trivial to copy into their viewer. HDR graphics required someone familiar with graphics codiing (of which Firestorm at the time and probably even now still doesn't have someone capable of doing), we fundamentally built features differently from Firestorm (not to be incompatible) because we felt we had a better approach to it. Those types of features we were working on are very intensive development wise.
When you look at the major contributions that were brought to SL, our team brought features like materials to Second life, the concept of request TP wasn't even considered to be brought into SL (and later developed by Jonathan Yap) until we built into our viewer for "medic teleporting" in the combat community. Kitty, Cinder, Sovereign and few others contribute to SL and make it better (that are mostly other viewer devs) to this day, I remain uncertain of what major changes or even major contributions Firestorm even brought in to the official viewer. Regardless these are irrelevant for user choice, Firestorm has the magic formula: Make a viewer that has everything, copy code as much as possible from other works to make it complete. There is no desire that I could see from them to contribute changes back to Second life as a whole and for them to remain the main viewer, I don't think they would want to and I don't think EV, with the best of development can compete against them.
EV's goal was originally to develop a viewer geared towards Second life e-sports, combat and visuals. With the introduction of TPV section 2.k, this has made the goals very difficult to accomplish because what we're allowed to do has been extremely limited and while old features can get through, through grandfathering new features cannot. I think EV's featureset somewhat became stunted when this was introduced and we never seemed to want to change our goals, nor could we seem to figure a way around it that worked well. Competing against FS was never a goal, but I think with the current goal, it would be hard to compete with FS, but I also think this goal now has become extremely difficult to accomplish, so change would likely be necessary for Exodus Viewer to be a fruitful viewer again.