Another thing to consider:
We tend to look at these situations as if it's *only* a question of performance. Nobody on this forum should claim to know what's actually going on behind the scenes.
Sure, Riley and Banker have had a relationship for a long, long time. How do we know that there wasn't a falling out that occurred over the 6-12 months? We don't know the story. We'll let it play out.
Obviously, if in two years we're no better on defense there will be a monumental grumbling from the fan base in its typical, fickle fashion. But just remember, we don't know all that's going on behind the scenes.