Todd DID NOT say that. That was the usual and unwelcome embellishment of game journalists. Read the article well. Thats NOT a Todd Howard quote.
I can't remember if Todd said the words, but even if he didn't, it also doesn't even say "Traveling" merchant, these are just extrapolations off the "Merchant" and our embedded image of the recent "Traveling Merchants" in New Vegas. Still, it's a cool concept to consider, even on such a drawn-out level.
Personally, I'd be surprised if there wasn't some kind of traveling-merchants in game. It made New Vegas's world feel a lot more alive. Optimally, I'd love to see caravans that not only include merchants, but also random travelers, banding together for 'safety in numbers" kind of thing.