If what you are asking is if it is rational to base a relo decision solely on airfare differences to SXM, my answer would be a resounding no! The fare differential may be a contributing factor to a relo decision, but, at least for me, there are many other considerations as well. Airfare is just one of many considerations.

That said, you are asking about 10 years down the line, so blue sky questions like this really help your retirement goal setting.