For journalists at the North American International Auto Show (NAIAS) in Detroit on Monday, it was a perilously short weekend. It’s a sign of the times: CES in Las Vegas has suddenly become an auto show — arguably with the same level of clout and significance as NAIAS, a stalwart of the auto show circuit. But make no mistake, these are evolving into very different kinds of auto shows. NAIAS is a pure car expo through and through;