To me the answer is simple. Diluted product. No different than the NHL expanding too much, if you take available product, spread over several outlets, each outlet suffers because there is only so much talent/product.
CBSSN
NBCSP
MLBN
RSN's
Tennis
Golf
Fuel
FSC
?BEIN
Various Hunting channels
NBATV
NHLN
And we haven't even had the new Fox programming.
And yet the majority of them want premium fees from pay-tv providers. Hopefully we'll see sports programming dropped from the various tiers and put into it's own package in our lifetime. Sure, dropping sports from the different tiers won't drop pricing, but prices probably won't go up at the current rates either.