Romney really is looking less and less like he is going to be able to win this election.
He can be statesmanlike & professional, ala Dole in 96, and take a gracious loss. He's down 12 in Penn by Rassmussen. This election, as things are going now, isnt close.
I think the time is not YET.... but if the debates come and go, we have some sensational headlines, and he's still down 5 points everywhere (and the $ starts drying up, most importantly), then yes, going rogue (loud, obnoxious, over the top) might help.
It might mean an upset, or it might mean he loses by 7 points.
personally, I don't think romney wants his legacy to be Palin II. I think he'd prefer a dignified loss.