Barely? Not even close - they've expanded into other states (VT, CT, ME, RI, NY), have better locations than previously and a "mega-store" on the auto mile. They sell comics, music, t-shirts, posters and a ton of manga (and probably too many Pops). They have a decent toy selection and the clearance is great when it happens. Bought multiple S7 Kang & Kodos for $50 a crack (each, not for the set).
The store has always made most of their profits from trend items. For years Mike (who I've known since we did the Sunday Funnies monthly boston comic con in the mid-70s, well before Newbury opened their first store) wanted to ditch the comics section because (pre the proliferation of GNs & Manga) it was a zero profit center. Think that's changed, but he hung in there because of the store's roots, even though the main business quickly became music from the '70s-'90s.
It was only strictly a comics shop for a few months in the '70s - they put in a small box of 7" punk singles on the counter and that quickly brought in more money than the rest of the shop combined. That's how they leaned into music.