A properly designed mobility protocol should support multiple home agents at multiple locations.And I would also like to see support for the homeless mobile node. So "multiple home agents" should range from zero to many.I'm afraid that the analogy between multihoming and mobility works here and that the homeless mobile node will be as useful as a zero homed sites in which hosts have zero prefixes.
Which, IMHO, are both fairly useful in certain situations :-) --Pekka NIkander