Kudos to Sam, and to anyone suggesting it's not a big deal, ask your gay friends how they feel (maybe they don't care, maybe they think it's been made too big of a deal -- many of mine are overwhelmed with joy). The biggest challenge he will face will be keeping this strictly about football. That is what will make a difference to future athletes like him. Celebrate the achievement for a day and then get to work.
I will say that staying in Missouri and working with Jeff Fisher probably gives him his best shot to do so. We'll see; the obvious question marks are still there and he has the weight of a community on his shoulders, but he'll do best to shrug those off and just compete his ass off.
Nobody is celebrating homosexuality, unless you've discovered the Rams' plans for rainbow alternate jersey day or something. They are celebrating the fact that this guy is combatting fear and stereotypes to play the biggest man's game in the country without having to hide who he is.
Everyone has the right to openly object to it and let the world know where they stand. It's a free country and if someone wants to deny themselves some friendships, business associations, compatriots... that's fine by me; I won't be the one limiting their experience of the world as it actually exists.