Waterproof a standard feature?

Seeing that ad for the Samsung S4 Active got me wondering if waterproofing, etc will one day become a standard feature. With phones becoming a bigger part of our lives, they are undoubtedly being exposed to more accidents then ever and having to pick the 'active' version over others, I think, is ridiculous. But doing so I would guess make them harder to repair without sending it off. Though I think that's a better trade off then making a slimmer phone.