Best I have seen for Ewers after our playoff exit is a 3rd round pick. Assuming that's true and where he would be drafted, and assuming someone is offering him $3-$6 million NIL to transfer and play another year of college ball, he should transfer and take that money.
More than half the players drafted in round 3 or lower will get their rookie contract and thats it. The average 3rd round QB rookie contract is worth 5.5 to 6 million over 4 years, or 1.375 to 1.5 million a year. Only the signing bonus of $800,000 to $1.2 million is guaranteed. He could get hurt, damaged beyond repair, and that's it.
If he goes pro this year, odds are he makes $5.5 to $6 million more on his football career and that's it. Maybe less if he gets injured and can't complete his rookie contract. If he transfers for $4 million, plays a season and gets drafted in the same spot for a single rookie contract, odds are he makes $9.5 to $10 million more on his football career and that's it. Maybe less if he gets injured and can't complete his rookie contract, but he'd have the $4 million in the bank regardless of what happens to him as a pro.
The calculus for "getting paid" for your football skills is changing radically and rapidly.