The data doesn't really support that assertion that there are more players leaving OU. I showed this either here or in the OU 2022 recruiting thread. It's been high (~ 50%) over the last five years. Several years ago, I went back looked at another long stretch and found similar numbers (you can rerun that yourself, if interested, I'm not going to do it again).
The ability to have transfers with multiple years of eligibility is the difference. I that situation, the new school has seen you perform vs college athletes, knows your grades in college classes, and knows you can be trusted to live in dorms. So a lot of the projection isn't needed. I could see OU, and other smart programs, take advantage of this.
Please spell out for me why this would be a negative to high school recruits. They know there are new players coming in behind them who are going to be talented. Whether the new players are from high school, 4-yr college transfers, JUCO tranfers, what difference does it make?
I agree with you about 2021 being pivotal for OU on the national stage. Of the four regulars in the playoff (Bama, Clemson, Ohio St, and OU), the Sooners are the only one with a returning QB. Certainly, the others all have top flight youngsters, but this situation doesn't come around that often.
Regionally, OU's not going anywhere as long as Riley's around. Sark may bring UT back, but it'll be like the Stoops-Brown era when you had annual top 10 match ups in the Cotton Bowl. I'd take that, wouldn't you?