i sure hope Christine leaves that sad useless Nicks-propping nostalgia boat and spends the time she still has creatively - she definitely still seems interested and has stuff to say!
so yeah maybe in 2020 when LB has his new album out and is done with his 2 different tours slated for 2019, and whatever touring current FM cover band version has still on the books should be all outta the way, maybe Chris and Linds will get together for a month and bang out another album as they did in 2014 and tour it. they certainly seem to work together seamlessly and their onstage fun together is contagious.
as for what happens with whatever version of the dinosaur nostalgia cover band will have at the time, nobody will care as most people don't even care now.
fun fact / dark humor but not unexpected - a fellow FM fan had this convo yesterday in a store:
Me: wearing a Fleetwood Mac shirt at Home Depot.
Cashier: "Sad that Lindsey Buckingham died"
Me: #*%^&($@@:&((&^%=#!!&**>_/#@@!!!!!