Do all writers have this?

I was at a meeting with some aspiring writers; I was one of 3 published authors, talking to the group.

One of the other authors said something like, "I started working on a book but it was beyond my talents, so I stopped writing it. I worked on {this one} instead and I hope to return to the other one someday."

Her words really stuck a chord with me because I've been picking away at a book for a few years that I would love to have see the light of day. The problem is: I don't know if I'll ever be good enough to write the damn book. It's a multi-generational story, set in a post-apocalyptic America (sort of "Book of Eli meets the Stand with a bit of Gone with the Wind thrown in"). It's a BIG book: in fact, it will probably be six or seven books if I let it take shape the way I think it should.

I return to it every autumn, without fail. For some reason, winter's approach makes me want to work on that series.I read what I wrote and I wonder if it's good enough, but I keep writing on it, keep it moving forward.

I'll probably self-publish it some day on the Kindle or somewhere (that's the way publishing is going, isn't it? Will there be any publishing houses left?)

Does every writer have "the one that got away" from them? Do we all have that "Big Book" we want to finish? It's not necessarily The Book of My Heart, but it's a story that I just can't put down...