I don't like Belichick, and I don't like the Patriots, BUT they made a big mistake letting Belichick go. They've already found out it's hard to replace a QB, now they are going to find out how hard it is to replace a great coach.
There were going to need to find a new coach, the only question is was it going to be a matter of time, BB is 71 years old. The Patriots have the third pick overall, so now might be the right time to start the next chapter. I am not saying I wanted him gone, if the announcement was BB was coming back I would have been happy with that, but I am not upset with the move.
None of us know how much of the decision was Kraft wanting to move on and how much of it was Belichick wanting to move on.