I'm sure the crew at WUMB would LOVE it if they could squeeze a few watts out at night on WFPB 1170. Even a relatively low-wattage night power might work relatively well in the fairly-saltwater-swampy Cape.
What's it protecting at night, anyways? WHAM? WWVA? Something else? You'd think given the geography that it wouldn't be too hard to make a DA that ensured nothing west of Falmouth heard WFPB...but the AM allocation rules have never made a hell of a lot of sense to me, either.
FWIW, I'm not sure they could easily go ND just because WDIS went away. There's still WCTF in Vernon, near Hartford, CT.
Also FWIW, one does wonder if the callsign "WDIS" is worth more than the facility is. I have to think the owners have been trying to cash in on that for a while now.