Ok but seriously, this might be the only way to combat WEI. Don't even preach to the user about the evils of WEI (ain't nobody gonna read that wall of text), just say it is not supported and tell them succinctly how to turn it off / get a different browser.
I agree; this may well be an effective last-resort action if Google Chrome does implement Google's WEI proposal. However, I sincerely hope that it won't come to that, because it's not a foregone conclusion that Chrome wouldn't win :(
