What is it that prevents the rest of the vim community from adopting neovim? From what I can observe, a great deal already have. But for the folks holding out, what is it that outweighs all that neovim has to offer?
The terminal and async stuff has been "backported" to vim, as it were. But the plugin ecosystem is diverging. The other items are still open, and maybe those will move forward.
At this point Vim9 is the clearly superior language (don't hate me) since it's very domain-specific, while Lua has only very primitive hacky support. But the plugin ecosystems have diverged -- I don't see NeoVim coming back home without native Lua support, and I definitely don't want native Lua support in vim.