Maybe it's just that I've been writing a lot of libraries, but I use 'mz a lot ;)
Besides, I can't imagine needing that combination of letters for anything else. Especially after having it refer to mzscheme for so long now, it would be hard to switch it.
It doesn't matter to me what it gets named as. pg could add it to the Arc core as %%%internal-compile-to-mzscheme, and I could still use "mz" in the code I write using load-w/rename or some similar mechanism.
I think that FOR NOW, 'mz is fine. Even though each person has their own patched-up Arc, it seems as though the vast majority are based on pg's Arc on mzscheme. If somebody is using an Arc built on some other VM (eg Rainbow on the JVM), then they will be putting quite different code within the body of an 'mz, so I don't think it's an issue that they'd also have to change the name of the symbol.
