As the person responsible for creating Gobby over at SkyGoblin, I can honestly say that, from what I can tell from what it is you're looking for in this thread, I doubt Gobby is it. It's not a generic tool for creating adventure games and we haven't really written it to in any way compete with AGS. I doubt it'll ever be possible to create a game in Gobby without a lot of knowledge in C/C++ and, depending on which platforms you intend to deploy on, some knowledge in Java, Android, iOS and Objective C. We're also a 2D engine and though it would take little time to add the rendering code to render 3D assets, we have no tools and no content pipeline for assembling them. As I'm sure most of us here already know, core engine technology's a very tiny piece of the puzzle when compared to the tools needed to assemble a game.
With that being said however, we're in no way precious about Gobby and I can't really see any reason not to share it at some point down the line. If someone else should have an easier time building a game of their own using our technology, that's a good thing and something we would very much like to encourage. At the moment we don't really have the time to package any of what we have into something coherent enough to be understandable for anyone outside of our office, but if there is serious interest in making use of what we have at a later time when we're not quite as bogged down in our own work and the code wouldn't just gather dust in a sad and lonely repository somewhere on the Internet, we'd gladly share what we have.