I think it's possible to live in a world more like equestria if you bring what you've found in equestria out into the real world. Like the lessons about friendship, or if you're influenced by pinkie pie's infectious happiness. It's like the opposite of one of us going to equestria and ruining it, but this way round it can actually happen. If your acting influenced by the show, it brings some of the colour of it into the real world.
But, I don't think one of us going to equestria would ruin it, because I think you're underestimating the robustness of the ponies. They're innocent, yeah. But they're also strong. Maybe if loads of people went, that would overwhelm them.