What I think this means is that they're going to nullify Catholic marriages, not all marriages. In which case, why carry that huge block of guilt and fear on your shoulder? Drop it on their foot and wave as you leave. Worst case scenario, have what the "good" Catholics call "a silly paper signing" that is recognized by the state? If that is at all necessary. You don't need a huge ceremony, either.
The part of infertility being a reason to nullify a marriage, however, is loony, even for Orthodox Catholics.
I noticed, however, that Pope Benny is continuing to sensationalize about gay marriage. Threat to humanity?
I think that the conditions of our fish stocks are greater.