Maybe, I don't know. This is one of the things that divides Wikidot experts (a rare thing, because mostly we always agree): is it better to make one site that does more, or more sites that do less?
Personally, I am in the "more sites that do less" category mainly because I work like that in all my projects: small, focussed, and easy to throw away when something better comes along. Bigger pieces are harder to throw away. Ironically I don't throw away a lot, but the option is always there. Already this blog site has gotten large enough that I'm thinking of breaking it up.
On the other hand, a single site gathers more moss, more users. If the Wikidot handbook and snippets were in the same site that might work better.
Email notifications seem to be a unifying factor. Over the last weeks we've been collaborating like mad on dozens of sites, and it's working fine. (BTW, I have decided to aware you a Black Belt in Wiki-Do for your work on Iron Giant. See http://blog.wikidot.com/main:hall-of-fame.)
At this stage, we don't know what works best. We need to experiment, compete, and be ready to apparently duplicate effort and waste. Over time the best patterns will emerge, get widely reused, and the inefficient ones will die off.
In this process, I utterly trust - from experience, not naivety - the collective intelligence of us Wikidot users.