I do feel like the argumentation here (whether you agree that PG-13 is fine or not) is a little selective.
People loved Dredd and it has been hugely successful in home video sales.
Watchmen, Sin City (1), Blade, and Kick-Ass are all good comic-based films that were rated R and didn't tank. I also think successfulness is a somewhat subjective thing, because many of the higher-grossing movies were absolutely terrible and widely panned by fans and critics alike. Attracting a sufficient audience and attracting the largest possible audience are two very different criteria for success and if a lower rating means more people but a worse film, I'll pick the critical darling every time.
My thinking has been for years that if they ever brought Wade to the screen he's far more likely to be recognizable in an R-rated film. That's not changed now. But I do agree with people that if they manage to make a very good movie and have it be PG-13, everyone wins; we differ in our optimism about their ability to do so.