For someone who believes the stereotype, probably. Your average Football Joe who thinks Trekkies are geeks will not get his mind changed by watching these films. Though he probably wouldn't watch them, anyway.
What the films do is highlight the passion these people have for Star Trek, and lets them voice what it means to them. Football Joe wouldn't get that. (After all, it's not like wearing a fright wig and painting your face in your team's colors, which is normal, right?) He'll just see the strange clothes, language or actions. It's impossible to change his mind anyway, IMO, so why bother trying?
These films are really about Trekkies, for Trekkies.