The first point has been done before previously, but you're fukking with someone's bread at that point and creating another Nichols/Taylor situation. You also end up creating a situation where multiple shows are competing against each other especially considering the plan is to still keep NBA Countdown. The easier answer would be to find a way to "promote" SVP, which would make the timeslot open.
To the second one, even if they wanted to replace local news they couldn't because of contract stipulations.
I do see why Kenny Smith was apprehensive about the transition and saying how they wished that the four were involved in the negotiations instead of others doing it for them.