I feel like the reason you don't see a web app development model that takes from the best ideas from both PHP model and the Rails/Django model is because by the time you've been exposed deeply enough to both of these approaches to truly understand the benefits and flaws of each you are way too cynical and burnt out on the idea of tooling around building "the next big web framework." Instead, after watching trends come and go, you just take whatever you can get for free and go out and solve real problems with it.