My first reaction is that Fox isn't dumb enough to turn SPEED into NASCARTV (although it kinda is already). Seems like taxes, TV rights will never go down. It's all about $$ rights and advertising. I don't even think they even care of about viewership as long as the networks get their $$.
No one is going to be happy all the time with the right mix of racing vs. reality tv. You just find the best mix you can watch. I will admit my tv is on velocity much more than SPEED.