Hello internals, In my opinion, right now what dictates the timeframes is Release Process RFC: https://wiki.php.net/rfc/releaseprocess It clearly states the rules of how things are done. If dates for the PHP 5.6 are to be adjusted, than it requires an RFC process and should be an exception, not the rule.
But, for what it's worth - it's fine as it is. Distros will support 5.6 as long as they need, you can always download older versions for Windows from php.net archive and so on. It still has almost 2 years in security fixes left, and that's more than enough time for people to make a move. Others will just not care to do that anyway for whatever reasons, and nothing can be done about it. Arvids.