I disagree. People may recognize Pepe but they don't know his name. If you put Pepe next to Gonzo or Fozzie more people would be able to tell you who Gonzo or Fozzie or Animal or Beaker or The Swedish Chef for that matter are before they could tell you Pepe's name.
Well the average person will say "oh! I love Kermit, Piggie, Gonzo...oh whats his name? Fonzie the bear? And I love those two old guys, and that chef dude"
In 20 years if the muppets are still around it could be guzgub, fleeber, noodles, zorkle and harrison the manatee as the main 5(ok, i made those up) but you never know with these things.
Remember in the 90's, when the main 5 was "kermit, fozzie, gonzo, piggie and animal"? And you saw nothing but merch featuring them, and only them?
I think most here would agree Pepe replaced Animal in the main core, as Animal seems to be more grouped with the Electric Mayhem now days again. I like seeing Rizzo and Beaker in top spots.
People and the public at large can live in nostaligia, but time and time again the Muppets prove they are ever evolving and timely as ever.