[...]
I wonder how long before someone figures out a way to update the firmware so that it creates an
unencrypted backup of your seed on the microSD card

I have tried the backup option. It creates a 12 word mnemonic that acts as the pass phrase to decrypt it.
Huh ?
What kind of backup is being generated if you still need your 12 word mnemonic ?
Are you sure that you need your mnemonic seed to
decrypt the
backup file ??
IMO, this wouldn't make much sense. The mnemonic seed should be the backup itself.
As i have understood it, it generates a backup (= encrypted mnemonic seed) which needs a password(?) to be decrypted.