Thanks for trying to do what many of us secretly wished we could do but can't because of time/skill constraints. I will definitely move to NeoVim the second it's packaged (is it yet?), regardless if you've changed anything yet. I hate the ideas many programmers have about backwards compatibility, that it's more important than development speed and modern concepts. There is nothing holy about Unix era software, chance…
The thing about compatibility is that it doesn't matter how great your new and shiny is if it can't talk to old things at all. Imagine the best new text editor in the world, but it's completely incompatible with every file format that's ever been written previously, even .txt! No one would use it, because the cost of switching is too high.
In some cases, it's definitely worthwhile to have some development pain to keep that around. Stuff like keeping vimscript (and therefore the entire ecosystem around vim) functioning means that neovim could be a drop-in for some people, and HAS to be preserved at least partially. Stuff like keeping ancient Amiga support or integration with Sun workshop? Definitely not worth it anymore.