Earlier quoted context omitted.
The vast majority of users (the U in UX) do not ever need to see a dotfile. In fact, you'd not want them anywhere near one.
So piss off the users that do? For a while there wasn't even the keyboard shortcut. Throw up a scary warning if you need to but I feel like it's a basic system function that should be included. Some how Windows manages to allow users to toggle hidden files through the GUI and I haven't heard of too many disasters because of it. I would argue it's actually worse with the keyboard shortcut on OS X because it's complete…
No because 99% of users will never need to look at a dotfile.