So ridiculous that old people can't get along. They still had great chemistry on stage. If you're gonna try to replace someone irreplacable, I like the Finn and Campbell additions but probably wouldn't buy a ticket to see it. Campbell is way too good to just sit on the sidelines for the next 20 years.
The previous time Buckingham left they replaced him with two guys. Not sure how I feel about this. Buckingham was/is my favorite part of Fleetwood Mac. But, I LOVE Neil Finn's songwriting and voice, and, as you mention, Mike Campbell is very talented.