Because according to the rumor mill his job is in now in question.
Prior to Jackson taking over three years ago the team had been to the post season one time in 17 seasons. Why you would want to get rid of a guy that has turned the franchise around and take it to the post season the last two years just sounds strange.
But there is some very real concern that his days are numbered and that prompted one fan to tweet who he thought was the team's CEO--Jed York (who happens to be the San Francisco 49ers CEO).
“@mac_tbo: @JedYork woud u like to win a championship? Then KEEP MARK JACKSON” I run the @49ers. Could save you time talking to the Dubs
— Jed York (@JedYork) May 3, 2014
Mr. York has a point there @mac_tbo.