I don't agree that people should be followers prior to voting on or adding example questions on proposals in Area 51.
However, I do think there should be some additional accountability, and so propose the following:
Under the list of Followers add a list of Contributors that include people who are not followers but have done any of the following:
- Voted on example questions
- Added example questions
- Commented on example questions or the proposal itself
- Edited example questions or the proposal itself
This would also provide another interesting metric - those that are interested in the site, or know enough about the topic to work on it, but are purposefully not following it.