Right away? Very doubtful. He's a smart enough kid to know that the 2021 season -- for him -- is about learning the playbook and getting paid endorsement $$$.
Stroud has potential to be a Heisman-type contender for the next few years with the weapons he has. Will be hard for Ewers to take the starting job unless Stroud flops. Then, it sets up Ewers vs. McCord for 2023. Will he stick around for it? I'd imagine so, but who knows.
To answer your last question........on paper, this is as talented a QB room as I've ever seen in CFB. OSU did have JT Barrett, Dwayne Haskins, and Joe Burrow at one point (and Barrett, Braxton Miller, and Cardale Jones). Bama had Hurts, Tua, and Mac Jones. During the late 90s and 2000s, Florida and FSU had some loaded QB rooms. USC in the 2000s, too. But never this kind of 5* depth.
To put that into perspective, they have more 5* QBs on their roster right now than we've had in the 21st century total.