Have you been paying attention lately; our costs and our traffic are growing exponentially.
Not forever.
I'm kind of assuming that at some point there will be YouTube-style videos embedded in many pages - e.g. for [[Hummingbird]], there might be a video which when you click play, will show you a hummingbird flying, and then again slowed down to show the mechanics of its hovering flight; And for [[Windsor Castle]] you might get a virtual tour of the highlights of the castle; for [[Vladimir Putin]] you might get a subtitled excerpt of a speech he's made; and so forth.
That'd probably impact on someone's bandwidth bill in a big way, although it's in keeping with the "media" in "MediaWiki", and certainly in keeping with an encyclopedia for the 21st century.
All the best, Nick.