tl;dr: Review the plan at the end directly.
Software has a changing nature; Drupal and its extensions are not the exception.
To be useful for a most of the users, those need to be on full releases, not only on the version control system; indeed the problem is not new and there is even a well-known phrase for one of its solutions: release early, release often
Therefore it is important to have a release plan.
Following after some context and reasoning, I propose a couple of practical guidelines on release schedule for contributed drupal extensions that I intend to use: release weekly until stable, then once a month following core shedule.