We actually hear this a lot and I find it really interesting, because it hadn't occurred to me before we left to think of this as a downside. The implication is that what makes traveling worthwhile is our later recollection of it, and while memories are certainly fun, I'm not sure they're necessary to enjoying the benefits of travel. We are constantly influenced by past events, even without actively recalling them, and I think travel's most salient benefit is in shaping our views, perspectives, and character. Obviously it would be awesome if the kids remember the trip, but we think there are other benefits that don't rely on memory but will shape them in happy ways as they grow up: spending lots of time together, being outside all day, exploring and growing curious about nature, etc. I don't know that there is ever an ideal time for something like this, and we knew that once the kids started school it would be harder to do. So here we are; if it turns out to be a total bust, it's seriously the funnest bust I could imagine :).