[David]

I used a process of elimination.

Monday Morning is an irrelevant name for an album.
Warm Ways is a creepy name for an album.
Rhiannon is irrelevant and creepy.
Crystal is really confusing because, as a metaphor, it’s a tenor without a vehicle.
Say You Love Me sounds a little demanding.
Landslide is prescient, given the band’s big success, but may be construed as a microaggression.
I’m So Afraid triggers all manner of neurotic sensations.
Over My Head is just barely interesting as an album title, but a band trying to rebrand itself may not want to announce that it’s in over its head.

World Turning is the only possible choice. It also sounds nice in relation to the string of album titles: World Turning > Rumours > Tusk > Mirage > Tango in the Night

I would have followed the Rumours and Mirage model and named the album something distinct from any of the song titles and that encapsulated the group’s new ties to the West Coast: El Lay