"I certainly enjoy working with Adam, and I hope we can have more success together. If I enjoy doing the half-season, I will do it for five more years. If I don't enjoy it, I will have to think about it."
Instead, he'll devote more time to car racing super saloon and saloon cars in New Zealand, referred to as late model in North America.
"I've always been passionate about my racing, and to be fair, I've probably only got four or five years left at the top level," Williams said.
"I had one season when Tiger was out for whatever reason he wasn't playing, and that was one of my most successful seasons."
Williams is still fighting fit as he approaches 50 and works out every day.
"I travel a lot because I go back to New Zealand on my weeks off," he said. "I race speedway, so you've got to be fit and sharp to be driving against guys who are mostly younger than me."
Williams may be golf's best-known caddie, mostly for his seriously successful partnership with Woods from 1999 to 2011. But it ended badly, and along the way Williams picked up a fair amount of notoriety.
At an awards night for caddies in Shanghai in November 2011, Williams received an award for best TV interview when Williams said after his new employer Scott won at the Bridgestone Invitational at Firestone that it was "the best win of my life."
When he received the mock award, Williams made a racial comment directed at Woods, a slur he apologized for when he saw Woods the following week at the Australian Open.
Woods and Williams remain distant, something that Williams would like to try to change.
"I think Tiger and I need to sit down and have a conversation," Williams said Saturday. "That opportunity hasn't arisen yet, but that's something I'd like to do."
Williams, who played as a young teenager off a 2 handicap and caddied for five-time British Open winner Peter Thomson as a 13-year-old at the New Zealand Open, says he's pleased with his success over more than three decades in golf.
"I'm very proud that I've worked at length with several players, and the success I've had with every player I've caddied for," Williams said.