This update was just posted by SatoshiLabs:
BCH wallet was taken down from TREZOR Wallet, until further notice. There is an issue which affects our Bcash backend server. We are doing our best to fix this as soon as possible. All BCH which were claimed to your TREZOR Wallet are safe and will be available again once we bring the wallet back online. Unclaimed BCH can still be claimed, but it is safer to wait for full wallet functionality. Thank you for your understanding.
I suppose this explains my original concern. As always, Trezor is at the front of the issue...always looking out for us!