Due to Walmarts clearance the signs are now apparent to what's about to get the whacking.. This is taken from my years of watching the walmart clearance go on, and for the sets that were discounted actually retiring the following late fall. The cycle goes on.. plus many of these follow the pattern of retirements.
I think these star wars sets are gone by Black Friday (that lego.com sale that usually signals the death knell to retirees).. Out of all of these, I think there are only a few that are good investments.
75099 - Rey's Speeder
75101 - FO Special Forces Tie Fighter
75104 - Kylo Ren's Command Shuttle (Kylo Ren's Tie Interceptor is on the way -easy replacement)
75131 - Resistance Trooper Battle Pack
75132 - First Order Battle Pack
75137 - Carbon-freezing Chamber
75139 - Battle on Takodana
75145 - Eclipse Fighter
75148 - Encounter on Jakku
75151 - Clone Turbo Tank (Guarantee this one is gone)
75157 - Captain Rex's AT-TE
I think two of last years Rogue One sets will get the axe, and I think it's these two, due to the clearance i'm seeing:
75154 - Tie Striker
75152 - Imperial Assault Hovertank
UCS retirement
75095 - Tie Fighter (This set is gone.. it's been backordered on lego.com and out of stock at other sites. It may get one more wave, and then be retired.. I think it easily goes before the Slave 1)