1. It's probably unrealistic to expect someone to adopt all the GNOME components. If such a person existed, I think we would have heard from him/her by now.
Ideally that person would have some ties into the upstream development community as well. It might be worth asking there directly if anybody has any points of contact already (I don't).
2. I'm willing to adopt various components on an as-needed basis. For example, since I want to update gimp and it needs an updated glib2.0, I'm willing to adopt the latter and update it to its latest release. I've just started working on it and discovered that it needs an updated gtk-doc, so I'll plan on adopting that too.
I think the current way of adopting as needed and then immediately letting it fall into orphaned status again is better than doing nothing, but eventually we'll run into troublöe with that model.
-- Achim. (on the road :-)