I'm in favor of it ending. While it's always sad to see a loved show end, the closure is almost always better when a series goes out on its own terms. I'd rather see a LOST or Fringe end with its own story, than a million other series that never had that chance. Plus the inevitable decline over time that almost every show faces.
So while I'm not in favor of it ending NOW, I am glad he is bringing it to his own conclusion, in his own time, at his own pace. Same for Breaking Bad and a few others.
The only reason to move it to an HBO or SHO is so we can get the real version of "Zou Bisou Bisou".