I like this idea, too. For example: When I worked on connecting Notable Lewis Carroll (Alice in Wonderland) to the tree, it took over 200 profiles to do it. I wandered around in the English Census for the Victorian Era quite a bit. (A very good resource for 1840-1920 if you've got ancestry.com access; it lists birth town, for example.) I wasn't able to make a connection until I found someone who'd emigrated to Canada, and eventually worked it in via that route. Once complete, there was no need to remain as manager on all those profiles. Better to open them up for adoption when/if an interested party wants to take them up.
I did it via the Watch List, but I had to open each profile one by one, then click privacy tab &c. For a couple hundred profiles, that really takes some time.
I love your suggestion!