Retiring soon is just that, "sale" is trying to clear. IMO the first wave will do very very well concerning the batman sets, all the classic vehicles, batmobile, batwing, then only the 2nd batcave, funhouse is probably a one off and catwoman unlikely to get another set till after the movies so 2017 at the earliest.
I recently rearranged and put all batmans vehicles in one cabinet, mobile, batwing, bat boat, helicopter, flash version batmobile and the plane from joker steam roller sets and lastly the bat which is mounted on sme 2 x 2 clear round bricks to make it look airborne. It looks the best cabinet by far, I see the vehicles doing very well i have no worries with superheroes investment wise dc or marvel, 6862 is one of the best of the rest display sets IMO.