So, while there may not be too much for him to think about regarding his short-term rugby future, boxing is another matter.
He has fought only once since winning the New Zealand Professional Boxing Association heavyweight belt against Clarence Tillman last year and that was the controversial victory over Francois Botha in February.
Williams apparently has already dodged a challenge from New Zealand National Boxing Federation heavyweight titleholder Tatupu, whose belt goes on the line against Joseph Parker in Trusts Arena, Auckland, on Thursday. Duco Events' Dean Lonergan is trying to force Williams into the ring against the winner of the fight with one of the largest purses in Australasian heavyweight history.
Lonergan ensured NZPBA president Lance Revill was at the Parker v Tatupu press conference yesterday to confirm Williams would be stripped of his title if he didn't respond to Lonergan's invitation.
"To be fair to Sonny Bill, I can't really see him accepting it within six months," Revill said. "If I was Sonny Bill, I would need two or three fights to get in shape. I would be looking at eight months, but in fairness to boxing, we're going to put the offer to him and if he turns it down we're going to have to strip him of the title."
Revill said he would be prepared to negotiate about delaying the fight.
Williams, meanwhile, apologised for closing himself off to the media before the grand final, saying he even changed his phone number in order to concentrate on his "dream".
He added that his exit from the Bulldogs was probably the most important thing in allowing him to win another NRL title.
"When I was a youngster I fell off. I never touched alcohol until I made first grade," he said. "I lost my way for a couple of years there but I'm proud to say I'm proud of the man I see in the mirror."