But are they going to go up against someone big?

Do Lilly, DuPont and Merck need /8? HP need a /7?

You decide. Make a policy proposal, if enough agree the database changes and is reflected in many ISP networks. "we route therefore you are" I imagine (ianal) they would have to sue every ISP using ARIN data, I don't see how ARIN should be sued for changing some text in their memmers database at the request of their members. If the prefix concerned wasn't in use on the net I imagine they'd have a hard time but they're probably all reading this and thinking "let's just advertise it in case someone land grabs anyway". If there were to be good reason to do this I imagine peopel would try a more friendly approach first. If the space was used in, for example, China on services that the legacy user never used and the new user never needed to contact the legacy user they'd probably not even notice. brandon