i foresee the Trezor replacing the offline wallet and its pc and being more secure since the offline wallets can be susceptible to a USB malware attack. as far as i know, there is no way to get privkeys off a Trezor so in that sense it is safer
I think this is a dangerous assumption to make.
Trezor has a larger attack surface than an offline laptop, since you have to plug it in directly to a potential hostile machine every time you use it.
You can reduce your attack surface with an offline laptop by using CD-R media instead of USB drives, or maybe by using the audio cable transfer method.