For the past few months, viewers of “This Week” — ABC’s Sunday-morning public-affairs program — have watched anchors Martha Raddatz and Jonathan Karl roam far beyond the studio, doing interviews with newsmakers in places like Lviv, Ukraine, and Arizona’s border with Mexico.

Remote broadcasts are hardly a new concept in TV news, but they’re unusual for Sunday morning panel shows — a genre built around the concept of a cozy Washington-insiders conclave. These on-the-road segments reflect a bit of rethinking and tweaking after years of drift and decline.