I almost think it would be worthwhile if the devs handed the code to someone else to complete multiplayer, however... I don't think anyone else could complete the masterpeice that the team here has set out to do.
The devs truly knew how to develop a polished mod. They did an amazing job on Belzebub, and I'm honoured they shared that with us. Thanks guys.
Opening the source would be the sane thing to do. It has been the sanest thing to do for a long time now - imagine what the community could have done with the mod during its hype period together with other mods. Alas, from what I read at least, the main developer has an unusually huge aversion to the idea of going open source, so yeah, the current version is most likely the final one. I am grateful nevertheless, but it is so sad to see the result of all that effort and care to decay gradually.