I personally think the high profile opining about chalice by the commentary crew during coverage had as much to do with the restriction as anything. They took subtle shots at workshop strategies through out the day, and into top 8 when discussing which match to feature rolled their eyes at the thought of watching a shop mirror. Which is fine I guess, some personal bias is expected. Dig then went as the other half of the hostage exchange. As the SMIP casters point out, replacing 1-2 Digs from another draw/filter from the library of blue 'stuff' is pretty straight forward.
Randy beuhler's incessant tirades against chalice were anything but subtle. He shoehorned his anti chalice opinions into almost every match he commentated- workshops or not. That said, I don't personally miss chalice, I just miss chalice in the format. And I agree that while DTT would likely eventually get restricted, it certainly seems like it was positioned as a consolation prize.