It would be nice to have the ability to add multiple hosts to a party. I know ECC has developers for McMMo, such as @NuclearW, so maybe they could do it?
Well, some good friends (Such as @matrix_rep and @Dccciz for the not4staff party) might want to co-host so they can manage the party together. You could also make a town party (As town chat channels are removed for the moment) and possibly have the co-owners be co-hosts.
But what's the advantage of that? You can set a party to be passworded if you want people to be able to join without the main host.
A passworded party can also have some problems such a members giving the party password to people you don't want in the party.