If the IRS ever gets caught up, your paper filed return without the IP PIN will only experience the processing delay of filing without the IP PIN. I don't know if that would cause IRS to request Identity Verification for your refund.
(If you don't expect a refund, it doesn't matter.)
see also, IRS Statement:
"The IRS announced today that a new option in the agency’s authentication system is now available for taxpayers to sign up for IRS online accounts without the use of any biometric data, including facial recognition. "
Once you are on the IP PIN list, there is currently no way to get off.
