USA is bringing Smackdown into their mix. They're obviously not that concerned with sinking ratings.
Yep.
The only reason Raw is three hours of because USA wanted it. The television and toy contract(s) are what run WWE these days.
Ratings obviously matter. But things will have to become much worse for anything to drastically change.
Mind you, USA is the same network that still tape delayed Raw during the Austin/Attitude era for the Dog Show. Once WWE came back from TNN, that has never happened again to my knowledge.