We intend to have a higher passive income when we "retire" than our current total income, savings included. As I've mentioned elsewhere on this forum, our plan is to give the majority of any excess to others- family, churches, charities, the less fortunate, etc.
To answer the second half of your post, about gobs of extra money, that's not something I'm counting on for several reasons, the two big ones being:
-I'm a clergy person in a denomination whose average church does not have a lot of money. If we were FI, I would be more than happy to volunteer my services to a congregation in need (I'm doing it right now, and we're far from FI).
-My plan for "being productive" post-FI is to focus a lot of my attention on research and writing. While it's possible that a book I write could produce a significant income, it's equally possible that my annual royalty checks will barely cover the cost of maintenance and supplies for my typewriter (yeah, I use one of those).
So, I could draw a significant salary from a church, write a NYT Best Seller, and be rolling in millions of mustaches, but it's not something I'm counting on, or worrying about.