Toys R Us and Pottery Barn Kids both exited Rockville Pike in recent weeks as their former homes — Mid-Pike Plaza and White Flint Mall — draw closer to dates with the wrecking ball. PB Kids bounced back right away, opening a new location at Mazza Gallerie in D.C. But Toys R Us, which has struggled for market share in recent years, says it has no plans to reopen in this area. The next-closest store is in Gaithersburg.