  The next generation of surveys of extragalactic radio sources will be
dominated by different types of objects than the jetted-AGN that dominate
surveys like 3C, 6C and 7C. Before radio astronomy becomes concentrated on the
new types of object, it is vital that we understand the cosmological importance
of the jetted-AGN that have been studied for many years. I argue that, as
observational manifestations of Eddington-tuned outflow events, these objects
may have more significance for galaxy/cluster formation and evolution than is
typically appreciated. Outstanding problems in galaxy formation may be solved
by cosmological simulations in which this type of outflow, as well as other
types associated with weaker jets, are properly taken into account. I will
highlight areas of ignorance which are currently hindering attempts to do this.
