Of course they are individually owned. Right now they can still do what they want. However the FCC wants spectrum space for the Telco's various data services. They have made clear they are investigating ways to condense existing channels, and are currently working on freeing Ch. 51. There a few possibilities - one would be most drastic - no license renewal for stations not using the allocated channel fully as of a certain date. Another would be more likely - and has already been proposed - to grandfather must-carry to allow an existing station with must-carry status to keep it, even if it moved to become only an added subchannel on another station in the market. This would be contingent on turning in the license of the original station and shutting it down. The cost savings to have only one shared transmitter would be attractive to any stations just running one or two SD channels. No cost to cable operators - they would just change the source channel.Except those three channels are owned by different entities. All three channels feature full time programming. All three have the opportunity to add or delete programs and extra screens as they see fit.