You all know where the short_tags, register_globals, magic_quotes and other stuff like that took the language and the problems it made. Doesn`t history teach us a lesson? I see that it did not for some active members of this list. Many are still cleaning up the mess of thouse optional php.ini directives, Ibhad to clean up myself one project, took me 2 months to properly fix it and make to run on PHP 5, anyway we ended up rewriting the whole thing from scratch, a year of day to day work. Now i write my stuff E_ALL, including strict stuff and I know for a fact that there is no php.ini switch that could screw up my applications on different hosting platforms (yes, some minor things can happen in specific situations, but any properly configured PHP 5.3/5.4 will run smooth). And now you purpose to add a switch that in one line can disable the application for good (and get it's sources spit out all over the place). And even if i write it in the right way - i have to convert every damn external library. Ok, i upload it to the host and guess what - it spews the code out because it is configured for the <?php tag!
It will never get adopted, too many legacy stuff, to many external tools. And php native templates? I dont neet any twig, smarty or any other stuff. And guess what - most template engines cache compiled templates, and they are - ta-daa - PHP EMBEDDED IN HTML CODE! Common sence is allien to some people on this list or what?