I don't think they could have paused the World Series for any period of time. Neither the teams nor the stadium was ready to just lock down indefinitely. Maybe 72 hours to a week to complete another round of testing. I'm sure the Rays would have argued for playing Game 7, and the rules may have been on their side.
It may well turn out that Turner was a false positive, like Nick Saban, which still doesn't excuse the process. But it was never a true bubble - who can even be sure if the players had perfect distancing etiquette from delivery people and hotel and ballpark staff, even if they didn't break any rules by going to 7-11 or something.
Could be true about the Super Bowl. The football plan never made much sense to me given the inevitability of winter spikes. On the other hand, baseball's urgency to finish in October was prescient.