We have a great advantage in this. One of our oldest cards has been bought and sold by several banks and is a Chase Freedom right now. It is a joint account. While Chase will not create new joint accounts it kept it a joint account when they bought it.
So, we can move all the points onto the Freedom and then whoever has a travel partner eligible card at that time can move them to that card and onward to other programs.
(I know it is not that hard to recreate a link whenever you change cards, or Chase changes rules, but we don't have to do that.)