The difference is more than the population of Berkeley, CA, and double the population of Nevada County, California. If the re-vote gets similar results, then a third time, with those results counting, but only if greater than a 1% spread is accomplished.
Otherwise two out of three wins is the final result. Like overtime in football. The cost as we shift to online voting would be minimal. What is the value of a country that knows itself, without doubts, anyways?