  Multicast is (almost) as old as the Internet, having become a tool for
increasing network efficiency but also enabling destination discovery in a
number of key use cases, although misaligned economic interests have limited
its deployment to domain-local usages. But recent advances in multicast
technologies as well as the identification of new use cases for which IP
multicast may be ill fitted yet network-level support may be desirable motivate
to re-think old perceptions of multicast and its use in the Internet overall.
For this, we return to the original question to which multicast is seemingly
the right answer, based on which we outline emerging new answers to what
multicast intends to achieve. Key to this is to re-formulate the multicast
question in an attempt to semantically and architecturally align different
answers, opening opportunities for more use cases to be served through
multicast solutions, thus also driving the need for more research in this
space. Our paper poses this new vision for multicast and investigates the
alignment of existing and emerging multicast solutions with it, leading us to
formulate a path for future research.
