convert to gift cards
I'm a fan of converting to gift cards if companies other than the airline that held the miles. Once done, they're property, thus making the restrictive T&C much harder to apply/enforce. I realize that the value of the cards is often less than the miles, but not if the airline confiscates them.
A clear statement in a will as to who gets them would help with probate (and inter-family relations).
Steve
PS I am a lawyer, but all I know about Estates and Trusts comes from law school 30 years ago.