Far too few have actually spouted here for us to earnestly roll our eyes at the idea, but we suspect that even here in Philly, where martini’s and swing dancing still somehow manage to cling to some sense of cultural significance, the pop-up trend is going the way of the Korean taco. If Makiman Sushi’s pop-up Thursday at Franklin’s in East Falls isn’t proof that this practice of setting up a fly-by-night dinner operation in the confines of another restaurant is losing its luster, we don’t know what is. Don’t get us wrong. Makiman’s sushi is wonderful, and Franklin’s is a fine local watering hole, albeit a noisy one with skeeball and 25-cent wing nights. It’s just that neither bring to the table anything exciting or new, which is at least half of what makes pop-ups fun. If Makiman’s crew rolled in and knocked out a killer izakaya menu, or better yet, if the Franklin’s fryer jockeys took over Makiman, and turned out Buffalo maki rolls and sashimi poppers that might actually be pretty cool.