Agreed, I've been fortunate enough to have some of my most treasured franchises get them. Rambo 4 was a perfect send off and at this point, it looks like no more with Stallone and if anything it would be a reboot later without him, which is fine, the Stallone Rambo series, which is what I watch and enjoy, has a solid start and end, great. Rocky, between Rocky Balboa and Creed has a great send off for the character, whichever you want to choose as a send off for him, either is satisfying for me, so I'm good there, again, future films will likely not include him or be a reboot and so be it.
I'm fine with Pirates continuing post Jack, but I think it should be essentially a reboot at that point, new universe and tales. I would like to see the Jack Sparrow era receive a proper send off. I actually would have been ok if AWE were the end, if we never saw Jack again, I'd be ok after that movie the way he ultimately gets the best of Barbossa despite what he tried, and that shot against the sunset is just awesome.
You did get lucky with Rambo and Rocky, but that took how many years....? And my gut tells me he isn't finished yet.
Bigger worlds like Pirates, Star Wars, Bond, Indy, Matrix, Batman, etc all seems to suffer from eventual exhaustion of good ideas and genuine reasons to revisit. Even if a reboot starts off well, it usually ends poorly.
Only LOTR survives nicely... despite the weaker but not horrid Hobbit.