So, on an alternate note: Wikimedia's needs notwithstanding, LAMP is a ubiquitous platform that's very useful for a large number of communities for various reasons. If Wikimedia decides to move on from Linux + Apache + PHP + MySQL and rewrite from scratch, or almost scratch, it would be a generous gesture to launch the current MediaWiki codebase onto its own trajectory as a separate project -- either under the same name, or something similar.
If that's the plan, it might be a good idea to start moving MediaWiki to be more of a general-purpose wiki plus Wikimedia add-ons. That would make the transition easier and more fruitful.
Just one man's opinion.
~Evan