Paleo becomes increasingly convenient over time as you find little things you can do to tweak it. For example, every day I eat a large steak for lunch which is impossible to cook in the morning and would be annoying to have to cook one by one the night before, so I just grill 3-4 of them and refrigerate them and take one in a pyrex container with me to work. It's even easier than if I went to a fast food place.
Regarding its lack of mainstream popularity, keep in mind that 10,000 years is still a long time, even though we dismiss it from our evolutionary vantage point. We're telling people that most of what they eat isn't really food, so don't expect it to catch on immediately.
Additionally, I think we're going to need to iron out a lot more of the details and increase the signal:noise ratio so we can give people clearer advice on things like weight loss.