Diminishing Use of Chalice?

[Nocturnal]

At the type I tournament in Raleigh on Saturday, there were quite a few Workshop-based decks and they all seemed to be running Trinisphere over Chalice in the main deck.  Is this because Chalice is too vulnerable to Gorilla Shaman and diversified artifact hate?  Or is it more for the lock after a Sundering Titan hits play?

[Kowal]

I don't really know what to say.  There's more than one thing wrong with threads like this.[/color]