[Kyng]

Well, if the internet has taught me anything, it's that 'always' is a long time! Even once-seemingly-unstoppable behemoths like Yahoo, MySpace, and Adobe Flash have fallen by the wayside, as something better has come along.

With that being said, PHP will probably dominate for the foreseeable future, since too many popular applications rely on it. Maybe, one day, something will come along that does PHP's job better than PHP itself does, but when or what that might be is anybody's guess.