you are asking me to stop being a fan. If sports teams were just the concern of the ownership there would be no fans. I would not be posting on this site at 11:00 pm on a Saturday night. 
Perhaps I just don't like the idea of anybody kicking my dear Celtics around.
That thought though is is very likely completely in your head.
Previous reasons Doc himself has given for wanting to take a year off of coaching:
1) Wanting to watch his kids grow up and play the sports they love, to be there for his family before they all grow up
And that's it. Meanwhile, what has Doc ever done to sell the Celtics short? He's never taken another job interview, or hinted that he wanted to. He has been absolutely loyal to the team, and come back even when the writing was on the wall that we weren't contenders anymore. This year, hes already committed to come back to coach what will likely be one of the most painful years to watch since the Pitino years (if KG and Pierce both walk, we're looking at a team that is going to be very, very bad..maybe not as bad as 2007, but worse than any of the other years since the new millenium).
Do you know how many coaches have coached the Celtics for longer? How many have coached more games for the Cs than Doc?
2, and 1. Heinsohn coached for 9 years, Doc has coached for 8, and only Red coached more total games than Doc, since the team's inception.
What more do you want on the resume of the guy stalking the sidelines? Doc isn't perfect, but he's one of the top 3 most well regarded professional basketball coaches currently employed by the NBA, and he's never said a bad word about the Celtics, or even intimated that he'd coach somewhere else, even though considering his age and the way these things work, it's a virtual certainty that at some point he will.