If Hayward opts out, I wouldn't re-sign him.
The SF position is already locked down (quite well.)
Use that money and go after a big man (PF or C.)
This is the problem with the NBA, with what money?
If we renounced every FA, Kanter opts out, waive Theis, etc. the Celtics will have.........about $15 million in cap room. So instead of an high level glut at the wing we can sign, someone on the level of Dwyane Dedmon? Yuck.
Celtics won't even have cap space the year after that because Tatum will then be on his new contract as well. If Hayward opts out the C's have to try very hard to resign him unless they're willing to downgrade the teams talent by a big margin.