User blog comment:Xean/Slick Skin and Wordmark Tips/@comment-2022446-20110728170907/@comment-3466295-20110728233451

Yep, that would be a problem. But if that happened, I'm pretty sure that wikia would maybe disable monobook, as it wopuld probably be redundant, but it can work having multiple skins for a wiki - see wikipedia, I think there's around 6 or so skins there.