By all rights it shouldn't take the Batfamily more than one month - much less two or three - to think of a way to get rid of Hush. The Wayne fortune should be able to withstand the disappearance of two or three billions without a scare.
Hush living in Wayne Manor, however, would be a different thing altogether, and I don't doubt Bruce would hate that a lot more. That and there'd be more opportunities to have Hush on page than if he was in a lair or a hotel on the French Riviera of some kind. :/
Green Arrow survived the loss of his wealth, if that's still in canon. It'd be awesome if there could be some mention of that. Maybe through Dinah or Roy to Babs or Dick, if an Ollie cameo is out of the question.