Also, of that list of N64 games only 4 required it for gameplay reasons. The rest it was purely aesthetic and you can't even tell or confirm that it did anything to improve some of those games.
Only a few games, such as Rare's Donkey Kong 64, the single player mode of Rare's Perfect Dark, the multiplayer mode of Blizzard's Starcraft 64 and Nintendo's The Legend of Zelda: Majora's Mask required it for play.
Never quote a Wikipedia page that is riddled with "citation needed". Hi there, my name's citation.
There was one other game which required the Expansion Pak for gameplay features and that is San Francisco Rush 2049. It enabled track 6, in-game music, ghosts in time trial, and a few other minor features. Granted, this isn't as major as something like the single-player mode of Perfect Dark, but every other game which used it did so for a hi-res mode. And it is very easy to tell when a game is running in high-res because it looks a lot more crisp, though this comes at a reduced framerate.
For the most part the Expansion Pak is equivalent to the component cable for the Wii.
But, I think the point here is that the Expansion Pak was absolutely required for only two games. However, it was released at a time when sales of the N64 were dwindling and it didn't exactly reinvigorate the system as Nintendo had hoped. And another important thing to remember here is that the Expansion Pak wasn't originally intended to be used with regular N64 games, it was originally designed for the 64 Dynamic Drive. Nintendo never exactly had big plans for it like they do with Wii Motion Plus.
There was one bundle which included the Expansion Pak, which was the Donkey Kong 64 Jungle Green bundle. I don't see why Nintendo couldn't offer more than one bundle with Wii as well. They've done it with just about all of their previous systems.