Yes it's rare but I think it would be foolish to just assume it's impossible.
I agree. As a person who also likes to be prepared, I want to have at least an idea of what I would do if a positive test would come back for me, my wife, or the friends we travel with.
In the plus column, I've yet to read of someone sharing an experience from Cozumel where this has occurred to them or someone they know (or even a 2nd or 3rd hand account.) I'm also fortunate enough that if I had to stay and quarantine, it would not be a financial burden - I'm not rich, but could cover a stay if needed. Being retired, I wouldn't have to get home for anything.
Did read about experiences of a few others in MX who tested positive:
Mexico travel: COVID-positive tourists stranded under CDC testing rule
When it gets closer to my Coz trip in Nov., as well as a Cabo trip in Jan., my considerations and plan to prepare if one of us tests positive would include:
* Are my wife and I
willing to spend extra days in a hotel where we could be in separate rooms if one test is positive and one test is negative?
* Would we both stay or would the one with the negative test go home?
* Doe the hotel I'm staying at offer onsite testing and an extended stay for a positive test (they did earlier in the pandemic.). If required to stay in 2 separate rooms, what rate will be charged?
* If the hotel doesn't offer an extended stay (I think they have to come up with something), what are hotels that can be easily checked into - if tested at the beginning of the 3 calendar days before flight home, it will give time for preparing.
We all want to think it is unlikely to happen to us, but there is no harm in trying to be somewhat prepared.