Fleetwood Mac is still going strong in Britain because of the British component, strong in USA because of the USA component, and the rest of the world because of a MacDonald style marketing component.
I sure someone can quote figures that the CH albums are still selling, the DVD (dreaming) sold well and is still going, and musician around the world cover CH songs regularly (Has anyone covered a Fleetwood Mac song?). Imitation is the sincerest form of flattery.
Fleetwood Mac died when Peter Green (great name!) left and was resurrected as a 'pop' band that gets together every 3-4 years, yell at each other, produce a sub-standard album compared to what they've done in the past, and do a half-assed tour so they can go back to their mansions to try and forget it ever happened.
CH is fondly remember by all the band members (Nick had a small gripe, but it wasn't much) and will be remembered for years to come as a great band live and in the studio. Why spoil something that good, by flogging the proverbial dead horse.
That's my 2 cents worth.