Why? They have two 5* QBs coming in and a guy (Ryan Day) well known for developing QBs. This is hardly the Tate Martell scenario from winter-spring 2019 after Dwayne Haskins went pro early and Joe Burrow had already left.
And I can't think of any QB on the transfer market even remotely comparable to Justin Fields.
I just read that OSU is expecting approximately 15 of the 2023 class's top-20 QBs to attend OSU's QB camp next month. Day and Lincoln Riley are absolutely balling out in recruiting QBs, so I doubt they'll be resorting to the portal very often unless they're in an unexpectedly sudden pinch.