Problems with legalized same-sex marriage

I've questioned how and why same-sex marriage should become a concern to "the rest of us" who have no interest in the subject. What difference will it make if or when such legislation passes.

An interesting video attempts to show how tolerance for gay marriage quickly (inevitably?) leads to intolerance for anyone who wants to disagree with the concept on moral grounds.

"We [the same-sex marriage advocates] own the public schools. If you send your children to our schools, we will teach them our viewpoint and we will not make accommodations for any other perspective."