Discord lets you separate servers into different channels for people to talk about different things. There is already an EA Discord, of course new and near term EAs are welcome there. I think it would be bad if we split things like this because the more the near term EAs isolate themselves, the more and more "alienated" people will feel elsewhere, so it will be a destructive feedback loop. You're creating the problem that you are trying to solve.
Also, it would reinforce the neglect of mid-term causes which have always gotten too little attention in EA.
I ask that far-future effective altruists and people whose priority cause area is AI risk or s-risks do not participate.
Yeah, this isn't good policy. It should be pretty clear that this is how groupthink happens, and you're establishing it as a principle. I get that you feel alienated because, what, 60% of people have a different point of view? (perish the thought!) And you want to help with the growth of the movement. But hopefully you can find a better way to do this than creating an actual echo chamber. It's clearly a poor choice as far as epistemology is concerned.
You're also creating the problem you're trying to solve in a different way. Whereas most "near-term EAs" enjoy the broad EA community perfectly well, you're reinforcing an assumption that they can't get along, that they should expect EA to "alienate" them, as they hear about your server. As soon as people are pointed towards a designated safe space, they're going to assume that everything on the outside is unfriendly to them, and that will bias their perceptions going forward.
You are likely to have a lighter version of the problem that Hatreon did with Patreon, Voat with Reddit, etc - whenever a group of people has a problem with the "mainstream" option and someone tries to create an alternative space, the first people who jump ship to the alternative will be the highly-motivated people on the extreme end of the spectrum, who are the most closed-minded and intolerant of the mainstream, and they are going to set the norms for the community henceforth. Don't get me wrong, it's good to expand EA with new community spaces and be more appealing to new people, it is always nice to see people put effort into new ideas for EA, but this is very flawed, I strongly recommend that you revise your plans.
This is a nice idea though I'd like to suggest some adjustments to the welcome message (also in view of kbog's worries discussed above). Currently the message begins with:
"(...) we ask that EAs who currently focus on improving the far future not participate. In particular, if you currently prioritize AI risks or s-risks, we ask you not participate."
I don't think it's a good idea to select participants in a discussion according to what they think or do (it pretty much comes down to an Argumentum ad Hominem fallacy). It would be better to specify what the focus of the discussion is, and to welcome those interested in that topic. So I suggest replacing the above with:
"we ask that the discussion be focused on improving the near future, and that the far-future topics (such as AI risks or s-risks) be left for other venues, unless they are of direct relevance for an ongoing discussion on the topic of near future improvements." (or something along those lines).
I like this suggestion - personally I feel a lot of uncertainty about what to prioritize, and given that a portion of my donations go to near-term work I'd enjoy taking part in discussion about how to best do that, even if I'm also seriously considering whether to prioritize long-term work. But I'd be totally happy to have the topic of that space limited to near-term work.
+1. I'm in a very similar position - I make donations to near-term orgs, and am hungry for discussion of that kind. But because I sometimes do work for explicitly long-term and x-risk orgs, it's hard for me to be certain if I qualify under current wording.