I wouldn't expect the USBC to make companies stop making balls that don't qualify if they are already approved. Balls like the BCB and SCB are very high diff balls, and I would imagine Lane #1 could keep making them as long as they wanted to, but they couldn't get, say, a Super Black Cherry Carbide Bomb approved with the same core. That's how I interpret the grandfathering clause.
I don't think it would be fair to the companies because anyone who had a lineup with high-diff balls would suddenly have to stop production on those balls and design replacements.
SH