The only restriction that could stop any language from being considered write only, is the restriction of the people that use it. With enough idiots, you get enough horrible code. And the number of hoops they have to jump through to shoot themselves into their feet doesn't matter.
Besides quite a few people would consider anything that contains regular expressions write-only. And I ain't gonna loose regexps due to some clueless script kiddies.
Enoch was right!
Enjoy the last years of Rome.