Yeah - me too. I can't see much future for sub-channels, with so much now available on the internet. As people "cut the cord," and streaming becomes even bigger than it is now, it will be hard for them to survive. Would you rather watch...say...Bewitched with more commercials that ran on the original show, and content edited to fit the half-hour, or sped-up, which I hear they do now - or- would you rather stream it, and have to suffer through a few seconds of internet advertising?
Unless those subchannels are affiliated with a Big 4 network, then they're useful. Examples would be the Sinclair-owned ABC affiliates in Birmingham (except for WBMA-LD) and Charleston, South Carolina. In this case, these stations were what I like to call "Howard Stirk'd". I wonder if any Tribune or Bonten stations will become "Howard Stirk'd". Minneapolis, is another story (with KMSP/WFTC & KSTP/KSTC; same virtual channel, different digital channels).
Sinclair, however, is not alone, Quincy also did this with WSJV-TV when they switched it to a subchannel network, H&I on it's main .1 channel. However, I wonder if WSJV-TV will once again, affiliate with ABC and WBND-LD gets H&I, and in essence, reversing South Bend's 1995 affiliation switch. In some markets, there is high cable penentration, but I don't know, considering that the rate may be decreasing from people that "cut the cord".
Top 50 Markets with subchannels having Big 4 networks:
9. Boston - WNEU & WMFP (excluding WBTS-LD) (NBC O&O).
15. Minneapolis* - WFTC/KMSP (MyTV/Fox).
45. Birmingham - WDBB, WABM, & WGWW (formerly WJSU-TV) (excluding WBMA-LD) (ABC).
48. Albuquerque - KRQE.2 (Fox, main .1 channel is CBS)