My initial though is that there is no way they trade him. But the more I think about it, the more I could see them trading him and I think I'd be OK with it.
We know they love Bryce Brown and had their eye on him for a while. He has a lot of the same qualities as Spiller, but offers more size and power. Brown is the key to the whole thing.
If this rumor is true, then I'm glad they waited to see what they had in Brown and Dixon before pulling the trigger. If they want to be a power run team, it makes sense.