Apache or PHP certainly can't last forever. While I don't know what will take their place, or when, or who will benefit, I do think we will see some trends going forward: More and more server code for web applications will be written in Javascript, as WebGL enables web-based gaming platforms, as offline applications share code between client and server, as Javascript becomes more popular as a language, and developers…
Interesting ideas. You just reminded me of a post Bruce Eckel wrote on what programming might be like in the mid future; he touches on some similar ideas. I recommend you give that a read to see what you think as I found it quite thought-provoking.