Hey John, thanks for reading! Since publishing this I’ve given some thought to the “minority-to-overturn” rule.
I imagine if a 60% vote to instate a law was required maybe a 50% (or 49%) vote to overturn would make more sense. Effectively 10% of the able voters would need to swing to the opposing side, thus (hopefully) solving the next-day turnaround problem (65% and 45%, or somewhere along that continuum, might work even better)
I agree the original numbers don’t make sense mathematically. I do think the minority-to-overturn idea is still one worth further exploration.