*A project ~~~~Revising the Fall of Gondolin*

[Aiwendil]

Okay, you make a good argument. How about this:

c. A decision made by voting may be changed if a new counting of old and new votes would alter the outcome or, if the active membership has changed drastically and previously unconsidered arguments on the subject have been made, by a calculation system in which both old and new votes are counted, with the new votes weighted so that their sum is equal to the total number of old votes, with the old votes of those members who are also casting new votes counted for the purpose of determining the weighting but not counted in determining the result.

This should replicate the behaviour you want exactly. The only slight change is that I've replaced the vague idea of active vs. inactive members with the unambiguous one of members who are casting new votes and those who are not.