I do not wish him success wherever he goes. No matter what his issues may have been with Belichick or Kraft, out of loyalty to the fanbase that has passionately supported him for 20(!) seasons he should've sucked it up and finished his career there.
It's not like he's Dan Marino, who played all those years for my Dolphins without a championship. If Dan the Man had been in better condition at the end of his career and left to play one more year for a team that was a legit contender so he could have a shot at a ring, I would not have begrudged him that.
But Brady has six rings, and more money than he could ever possibly spend. Not to mention that his wife's independent net worth is as much as his, if not more. So what is he chasing at this point, by going somewhere else?
I do not think this decision is going to end well for him, as it shouldn't IMO. I hope to see him regret it.