I would REALLY love it if you can use the device to sign messages as well! I could use it to verify my identity online securely as well. Like a secure pgp key but using Bitcoin private keys to sign the message.
so now all a thieves has to do is find someone with a huge bitcoin wallet. sniff out their ip, reverse lookup ther vpn to find there real address, narrow down your location, come and take you hostage at gun point and force you to give over your "hardware wallet" usb. this makes bitcoin no different than real money now in my opinion.
I don't think trezor is meant as a solution for long-term secure wealth storage.