No matter how much PHP is improved upon, until there is a serious contender framework for it like Rails or Django, PHP will continue its route to extinction. Dinosaurs were once big and powerful. They dominated the landscape. They don't exist anymore.
I'm not sure if you're serious, but there are plenty of frameworks on a par with Rails at least (nb: I have zero experience with Django).
At the enterprise level, there's Symfony or Zend:
If Rails is your thing, CakePHP shares some concepts (although I'll be the first to admit CakePHP has many flaws):
Want something lightweight that's easy to jump into? CodeIgniter's the one for you!
And finally, my favourite, Kohana. Absolutely infuriating since they essentially stopped writing documentation for new versions, but if I need to get something written quickly and reliably, this is my go-to call:
There are tonnes of "serious" frameworks for PHP (I've certainly missed out a few), and frankly, if you're going to try to attack PHP, this is the wrong angle from which to do so.