Today’s Supra CC is a humbling reminder that Toyota has stumbled before. With all the hoopla about Chrysler’s sales being down 38% this year, its easy to overlook that Scion’s sales are crashing, down 51% this year, and a whopping 66% since its peak in 2006. That year, Scion moved 173k of its youth-oriented cool-mobiles,even if most of them went to the target buyers’ parents. This year, Scion will be lucky to sell even 57k units. Time to prune the family tree?