Scott will DEFINITELY mellow with age, as he himself predicted in a 2007 interview in Blender Magazine:
"What are you gonna be doing when you’re 65?
Scott Weiland: Hopefully, breathing. You know, riding horses, fishing, [takes a drag from a cigarette] not smoking, having a great relationship with my wife and kids. I’d still like to be writing songs, but I don’t wanna be shaking my ass onstage anymore. Doing music in a dignified manner — not in size-27 skinny jeans"
In 2008 interview in USA Today, Scott added:
"I don't want to get battered from throwing myself around on stage. I want a performance style that's more cerebral and emotional than physical. I want to be a creative artist, not a whirling dervish."
If still touring, Scott would cut all of the harder stuff from his setlist and focus on his melodic songs. Maybe even full accoustic shows on a candle lit stage with Scott dressed in a very nice suit.
With all of that taken into consideration, here's my prediction of a setlist for the show:
Interstate Love Song
Creep
Big Empty
And So I Know
Adhesive
Sour Girl
I Got You
Atlanta
Hello its late
Loving the Alien
Gravedancer
Killing Me Sweetly