With Dan Slott leaving Amazing Spider-Man, it's worth looking at how other Spider-Man writers ended things. There isn't much of a pattern. Sometimes it's planned and it's good. Sometimes it's planned, and not so good. Sometimes it's sudden and terrible. Sometimes it's sudden and works out well.
Stan Lee left with a cliffhanger in Amazing Spider-Man #100. And then he did it again with Amazing Spider-Man #111.
Gerry Conway was the first Spider-Man writer to tell a big story tying up all of his loose ends. So he probably set the gold standard.
Len Wein kinda did the same thing with the Bart Hamilton Green Goblin saga.
Marv Wolfman left in the middle of a two part story, meaning others had to resolve plot points he was setting up.
Roger Stern left in the middle of a story, but DeFalco took the pass pretty well concluding a Hobgoblin three-parter, and then telling the Alien Costume saga.
Mackie appeared to have some advance notice he was off the title, although his final arc wasn't that good.
JMS also had advance notice, although there were quite a few changes to the story he was planning to tell (Back in Black was greenlit well after One More Day; his script for Parts 3-4 was different than what was delivered.)
One interesting conclusion is Paul Jenkins, whose run on Spectacular Spider-Man was poorly regarded, but who did get a decent final issue.
So it's going to be interesting to see what happens with Slott.
He's been in a position where he could prepare for some time for a big finale, and he's also doing 801 as a one-off with Marcos Martin. It does not appear that he's getting any big mandates on setting up a particular status quo for his successor.
Do you guys have any thoughts on the conclusions of the Spider-Man runs, and what it might augur for Slott?