I still wish cable systems would stop down converting their IS2s to make a fake digital MPEG-2 "SD feed" that's fully letterboxed and use the IS2 only on the actual MPEG-4 HD feed. I also wish cable systems would combine both the IS2 for the HD simulcast and the IS2Jr. for the SD simulcast so that way, the actual SD simulcast wouldn't be letterboxed and still have the main IS2 shown only on the actual HD simulcast plus the IS2Jr. on the SD simulcast. It's still a waste of bandwidth.
The thing is, most headends prefer to just having the IS2 and the HD feed simulcast alone, primarily to avoid the time and money maintaining another STAR (i.e. the IS2 Jr). The acquisition of a STAR system isn't exactly priority number one for a lot of cable headends (e.g. think of Comcast and their X1 DVR systems) even though The Weather Channel requires headends with the TV network to do so.
Also, I do like the idea of running the IS2 Jr through an IS2/HD feed simulcast, but that idea seems technologically impossible IMO.

Even if it was possible, the trouble is that headends would have to program the IS2 to not display LFs and only LDLs, vice versa for the IS2 Jr. Another problem is that you'd probably be hearing Cantore's narrations twice during LFs like an echo effect, because the IS2 HD would be simultaneously running in the background behind the IS2 Jr. So, the thought of running an IS2 Jr through a letterboxed HD feed simulcast may sound great, but as I said, that idea is technologically impossible.