I don't think anybody can say whether he will or will not coach until he is 60, 70 or if he will retire after next season (although I seriously doubt he retires in the next 5-10 years). Money certainly will not be the issue but he might like it or he might be motivated to set a record. If I had all the money in the world, I don't know that I would retire becasue I don't know what I would do all day.
If he coaches until he is 70 and continues to win 29 games a season, he will have well over 1,000 wins. I am pretty sure his 467 wins is based on last season. That means he will be darn close to 500 after this season. At 29 a year he will have over 1,100 wins if he does another 21 seasons.
Coach K doesn't still coach because he needs money.