I believe before the doomsday cuts the 48 picked up plenty of steam north of Broadway. However, once those cuts began it was all written. Now, present day with all routes being controlled by Grand Avenue including the 48 the frequencies completely suck. I believe when the route was under Fresh Pond and Gleason controlled the frequencies were a bit better.
Should the route be split. Yes.
via Union Avenue = NO
Pleasing the Greenpoint, Northside and Southside Williamsburg crowd is a tough one and will be even tougher once the is shutdown.