I don't blame any player, ever, for asking for a trade kicker.
These are still people we are talking about. They get paid really well to play a game, but they still have lives outside the dozen hours we may see in a week.
You buy a house, you put your kids in school, you make friends in the neighborhood.
If the company you work for wants to transfer you, you get perquisites. Home sale allowances. Out of country living allowance. It's the same thing in the end.
A mid season trade would be even tougher. You leave your family for, essentially, the rest of the season. Bye, honey. See you in May or June!
Dude just wants to be compensated for a REAL inconvenience, if it happens. If it doesn't happen, no harm no foul.