None is going to do anything between, forget about it. Glorious dreams you have, nothing else.
No project wants to have too many people working on it, too many opinions lead to lack of consensus, problematic to work, agree on ideas, solutions, even to agree on basic level of common sense. Doable, yes, hard, yes, but practice shows it's near impossible if you force the wrong people to work together. 2238 developers agree with each other most of the time, they don't have such hard discussions like we have here on the forum, in a way they are more effective than larger cells and is better to not force more developers into their ranks or anyone else in that matter.
Merging projects, developers, technical features of servers is the worst idea ever.
Someone who wants to help a project, has the necessary skills, motivation, head on his shoulders, will find a way how to collaborate, blend in with an existing team, that's the smart thing to do, but that's a different story. Go try to convince the developers of TLAmk2 to drop their server, focus on 2238, give all their features, ideas to them and to eventually work together, sounds nice or not? Zero percent of success in any case, no matter what server, what people, the only thing that matters is own ambitions, ideas, dreams not the community. More servers = less of a community, more and more remnants until all the servers dry out eventually because of lack of players, that's what i predict.