A fundamental advantage that transport-based locator-pool schemes (SCTP, DCCP, TCP-MH) have over wedge-layer approaches (HIP, LIN6, MAST, MIP) is that they can multiplex the control exchange in with data traffic, potentially saving on number of packets. Wedge-layer approaches are forced to have an explicit, separate exchange.
1. An endpoint runs Locator Pools (LP) as a resource shared among different consumer services at the endpoint
The Internet today already have DNS cache, which even enabls sharing beyond an endpoint.
The obvious direction this idea leads is towards an effort to produce a common protocol. Clearly it should include the locator "characterization" attribute-signalling capability that Erik suggested.
Some characterristic of a locator is already stored in an endpoint as routing table entry or cache.