Not ironic at all. CH made a small number of quality LPs, and broke up at a peak when NF decided to continue under his own name.
Fleetwood Mac peaked in the late 70s (or when Peter Green* was in charge, if you think like me) and Fleetwood, McVie, and whoever else is around continue to milk the name for all it's worth.
Where's the irony?
* edited to add - I'm referring to the OTHER Peter Green.