I don't mind that they never played a tribute show, and I can imagine a million different reasons why it's perfectly justifiable they didn't. Hell, Chris hasn't had a show like this either, just individual bands paying tribute at their own shows (which not many besides Chris did for Scott, BTW)
But what I would like to see going forward (if they ever start touring again) is to play Plush every night just as you suggested with a spotlight on the mic-stand and with just the audience singing.