Kanter will be back. There are enough minutes at the 4/5 for all 3 bigs to get their minutes. Kanter's value won't have anything to do with him demanding a certain amount, and he won't have any say in whether or not he starts. His value will be whatever someone else is willing to throw at him, and if Utah decides to match, he's a Jazzman, regardless of coming off the bench or getting paid less than he thinks he's worth. Utah isn't in a financial position where they have to let Kanter go. If anything, he could be traded, but simply letting a #3 pick walk for nothing would be another asset wasted. Not happening.
Kind of like how letting Millsap, who was an actual boss, was let go for nothing? (and his contract was actually super reasonable)