I don't care that much about the implementation, but I would like to see an emacs environment with:
- instant startup
- blazingly fast scrolling
- minimal keypress-to-display latency
I have written a lot of elisp (and had to deal with with buffer variables, dynamic scope, etc.), but aligning with modern scheme or lisp (if it can be kept compact and efficient) probably makes sense at this point. (Current emacs should provide backward compatibility as needed.)
Since so many people use emacs as an IDE, I think having an official emacs co-project/subproject focusing on a standard, extensible IDE framework (perhaps for other apps as well) would make sense.
It still seems like a pain to display graphics in emacs in various terminal apps. This should be easy, fast, and standardized.
As others have noted, supply chain attacks against open source are rampant, so vetting and sandboxing packages seems to be more important now.