The new plan is intended to use more democracy and less moderation to achieve a happy medium in making decisions about historical content.
Unfortunately, the voting system designed as a sanity check on close votes is not ideal for this.
Once the first delete vote is cast, those opposed to deletion can do nothing but sit and fulminate until the vote passes. And that could take months, since they don't expire.
Then, 10 of those folks can reverse the process, and what do we have? A war, and a call for moderator intervention.
Here's my alternative. A vote to delete a question that would have required 10+ votes in the old scheme should lead to an actual poll. For a fixed period of time, anyone with the required rep could vote for one of three outcomes: (1) leave open (2) mark historical (3) delete.
At the end of the period of time, a simple majority wins, and mods are called in for ties.
Now, people can express their opinion immediately, and the result reflects the total sense of the community on the subject.