With Silk Roads available, Bureaucrat's Silver gaining becomes much more powerful. For the trashed down deck to win, you need to win the Province split decisively and end the game quickly. With all your coppers gone, you can't afford to buy many Duchies or Silk Roads. If your opponent falls behind in the Province race, his deck is capable of making up the difference with Silk Roads. Thief is also better on this board than usual.
Copper is a card that is often undervalued by players after they start thinking about trashing. Especially on boards with certain alt VP (Duke, Silk Roads, Gardens), Copper is great. And even for Province strategies, Copper is still cash.
I'd say for a Chapel deck to work here you need +buy or a stronger attack to play a lot. Virtual coin would also be a nice defense against the Thief.