My guess is Axl isn't bothered putting an album out 'cause he cannot make enough cash out of it and he is probably too sensitive to face up to the scrutiny.
Its all about the $$$$ now and when you are 50 years old (with a whole family of hangers on to pay) I guess that's inevitable.

I think Axl and Team Brazil know that the re-birth of GNR has been botched so many times that its too late. GNR are now in the same holding pattern as Motley Crew, Faith No more, STP etc.. They left such huge gaps in their output that the fans stopped caring and will only show up in large numbers for the hits. 

So its either: be 50 years old play your new shit in club gigs (where you haven't been since you were a boy) or else play the Greatest Hits and fill a shed/arena, taking home more retirement cash.

U2, Metallica, PJ, Bon Jovi etc escaped this fate as they stayed together and kept working. Soundgarden don't seem to care about the money so seem free to do as they please.

Its about the money now and nothing else. Why bother being an artist when you believe that the whole world has been colluding to stop that happening.

Changes for me over the years. Right now I'd go with:

AFD: Nightrain.  (Honourable Mentions: Brownstone, Jungle, Paradise City)

Lies: You're Crazy

UYI1: The Garden. (Honourable Mentions: November Rain, Coma, Perfect Crime)

UYI2: You Could be Mine (Honourable Mentions: Locomotive, Civil War)

TSI: Hair of the Dog (Honourable Mentions: Down on the Farm, Black Leather, Since I don't Have You, Aint it Fun)

Chinese Democracy: There Was a Time (Honourable Mentions: If The World, Madagascar, Scrapped)