The warning is definitely appreciated but I doubt anyone would fall for this and type his seed. What was the URL of the phishing sites by the way? A screenshot has been posted but it shows the original site in the address bar.
"The fake Trezor Wallet website was served to some users who attempted to access wallet.trezor.io — the legitimate address. We do not yet know which attack vector was used, but the signs point toward DNS poisoning or BGP hijacking."
It would've appeared as the correct URL.
You have to type your seed into the computer anyway if I remember rightly. It's the order that you don't reveal and that's what this site was angling for. If you haven't done anything with your seed since you got the device it's possible you wouldn't remember that bit.