The real reason(s) Christine is returning.

[Wdm6789]

Any theories?

My theory, it might not be the most original, but what the hell, is that Christine recently turned 70, the rest of the band isn't far behind her. I think she might have had an epiphany and realized being in Fleetwood Mac was her accomplishment in life, her legacy. I think she might have thought to herself "do I really want to die without ever playing with them again?" John getting cancer may have also attributed to this, he must be doing well though because they keep adding new dates to the tour.