I don't think anyone is really saying that. It is true that wifey has some major pull in where you'll move to for a job. Just ask Hedo Turkoglu.
There are battles you pick with your wife and battles you don't. For hayward he may not care about winning and so if his wife wants miami, he gets to be the #1 option, no state income tax, and in the leastern conference, those things may all add up.
If he likes brad stevens as much as has been said and wants to go to the finals, boston is his place and he will have to convince his wife to be on board.