I've seen Fleetwood Mac many times.  Quite a few times early on and several times here recently.

ALWAYS a fantastic show!

The band Fleetwood Mac has always had a tumultuous history.  Why would this be such big news?

Seems to me the new dudes are quite accomplished and should be a worthwhile addition(s) to the band.

Love Lindsey, but time marches on...

"I've seen Fleetwood Mac many times. Quite a few times early on and several times here recently.

ALWAYS a fantastic show!

The band Fleetwood Mac has always had a tumultuous history. Why would this be such big news?

Seems to me the new dudes are quite accomplished and should be a worthwhile addition(s) to the band.

Love Lindsey, but time marches on..."

100% ditto here. I've seen them once... It was 2013 or 14, prior to Christine rejoining the band. All the greats are getting older, as are some of us. As much as I enjoy Lindsay in FM, I would be open minded to see the upcoming tour with Mike and Neil. Thanks for the recommendation for FUTURE GAMES. I am just now delving in to some older Mac I now have as part of an LP collection I recently bought. I have been enjoying Then Play On, and will likely reach for FG next. 
I would think it could be weird for Neil and Mike to sing and play Lindsey's parts, and even just to be in Fleetwood Mac. It's not that much different to being in a Fleetwood Mac tribute band! Neil's a fine songwriter, and now he'll be performing someone else's compositions. I wonder if the gig is just for touring, or if Neil and Mike are permanent members and will be recording new material with the group. Fleetwood Mac's fourth incarnation?! Or is it the fifth? Still my favorite lineup is that of the Kiln House album era. For guitar players it's the original, Peter Green lead version. I have been wondering what Mike Campbell would do post-Petty, and now have the answer.
Of course I was a HUGE fan of the Buckingham/Nicks era Fleetwood Mac, but recently went back to revisit the early stuff.  I'm not a fan of the first three albums, but from Kiln House (1970) to Future Games (1971) to Bare Trees (1972) to Penguin (1973) to Mystery To Me (1973) to finally Heroes Are Hard To Find (1974) these albums are pretty incredible.

IMHO, these era albums are overlooked/underappreciated because they weren't big commercial successes like the later works.