Just don't think that is really practical. If we as a community did create an editor that was awesome and most everyone liked that might be okay, but as it is there are just too many different opinions on editors and most all of the free ones seem to lack support for one thing or another that many of us use editors for.

I use Ultra Edit and Admin Script Editor (neither are free but are great tools). I also install Notepad++ on many systems just in case I want or need to use something a little better than notepad when I'm on someone else's machine. But if I really have to I'll use Notepad as it does cover the basics.