I am in favor of a time limit. Yet, October 1 seems a bit too long for the initial governance decision (i.e. how to decide how to decide). My perspective, based on transitions in non-profits and the corporate world, is that the longer an organization let's it draw out then fear, uncertainty, and doubt creep in.
We have PEP 10 in place for a strawperson vote. It seems as good as anything to use to determine how to make a decision. Perhaps set a 30 day deadline to submit decision process recommendations. Then take a strawperson poll on each and at the core sprint create a time window for specific proposals on structure be submitted before October 1.
My concern if we leave how to decide until at least Oct 1 that the likelihood of completing this year is fairly low.