In Van Gundy's case, a source close to him said he was "intrigued" by the Warriors' position but didn't want get back into coaching at this time because of family reasons. According to a separate source, Sloan indicated to the Warriors that he was not likely to coach again.
My sources tell me he turned them down because they have too many shooters on their team. Also, I'm my own source.
It really would have to be a perfect situation for Sloan to come back. He's worked with young teams before but I really think he would only coach a team with established veterans that are already in the playoffs. However, with teams like that, they don't usually have coach openings.
With another couple months of retirement Sloan may just get used to it instead of his daily basketball routine that he's had for 50 years plus. That would change his "not likely" status to "stop calling me."