A lot of affiliates are slightly redoing the Lbar and keeping the channel on-air. Some are more redesigned than others, and some more hideous than others. See examples below:
One of the nicer designs, WKYC/Cleveland
WTMJ/Milwaukee
KGW/Portland (OR)
An uglier design, simply by rebranding the channel "NBC Plus." Seeing as how this is an NBC O&O, it wouldn't surprise me if all the other NBC O&O's follow suit.