everybody who cares about development is already using them.
Even if we take that statement as given, what about everybody who doesn't care about development? Most modern frameworks take it as given that you are (or at least aspire to be) a fairly serious web developer interested in serious web development and are willing to learn a bunch of fairly abstract concepts up front about structuring and deploying apps. Until a framework comes along that assumes non of those things, php won't be replaced. Imagine your user is a domain expert in an area totally unconnected to computers or programming, but has managed to learn a bit of HTML and now needs to put together a site. What current framework targets this particular use case?
Something that doesn't involve any programming. Because getting all of the bits of web development together is hard work, and you're not likely to end up with anything decent at the end if you don't know what you're doing.
Even if we take that statement as given, what about everybody who doesn't care about development? Most modern frameworks take it as given that you are (or at least aspire to be) a fairly serious web developer interested in serious web development and are willing to learn a bunch of fairly abstract concepts up front about structuring and deploying apps. Until a framework comes along that assumes non of those things, php won't be replaced. Imagine your user is a domain expert in an area totally unconnected to computers or programming, but has managed to learn a bit of HTML and now needs to put together a site. What current framework targets this particular use case?