I do feel the numbers are quite small at this point and time. If only Oprah would get it noticed there might really be an explosion of popularity! My little dream/fantasy would be to open a paleo eating restaurant.
I run into people all the time that, while not full-on paleo, are keenly aware of certain ideas. The Vitamin D thing is catching on everywhere, for example. Lots of people take fish oil and are aware that n6 is bad. And a lot of people are talking about gluten intolerance. Enough people that mainstream media is doing hack pieces to discount the need to avoid gluten for non-celiacs. Grass fed/organic food is becoming more available. Plenty of people believe in carb restriction (or at least that sugar/fructose is bad) - even if they don't do it personally. I've run into people that started going to farmers markets under the influence of WAPF/Nourishing Traditions. And many people are starting to dismiss the lipid hypothesis.
Are they all coming from an evolutionary perspective? Nope. But progress is being made. The popularity of The Primal Blueprint and The Paleolithic Solution on Amazon are also encouraging signs. And do a Google Trends on 'Paleo Diet' - increasing rather nicely, I think.
Also, Jimmy Moore did a poll recently that showed that 25% of his readers were primal/paleo. Which was a huge jump from the previous year. I think his podcasts boast around 50,000 listeners.