I think he becomes part owner of the Titans sometime soon. Or he could hold Elite QB camps for NFL QBs. $1MM/pp That would be cool!
That would be difficult to do on anything other than a token level. According to Forbes, The Titans are valued at over 1.1Billion and the league rules on ownership (except the Packers) are designed to prevent conglomerates and interest groups from buying teams and having multiple owners. They like the individual ownership aspect for lots of reasons.
As an example on what it would take to buy a stake in an NFL team, using the Jaguars (valued at 775 Million), roughly a 3% stake would be $25 Million so I'm guessing for Peyton to get even a 5% share of the Titans would cost close to $58 Million.
Peyton's rich but owning an NFL team is for the WEALTHY.
I would say with that kind of money he could buy some more Papa John's.