Surely this would be a great opportunity for Sky to fill the empty spaces on the F1 channel with more motorsport. This would possibly help justify the cost for some people. For example, it would be nice to see Nascar, Indy, DTM etc.etc all in one place.
It would be nice for the channel to be filled with more content rather than a lot of filler. For many months of the year the channel is empty.
If Sky tried that they would end up with events clashing and would then have to show other live motorsports on the standard sport channels or start delaying things.