It's a relatively small movement with a handful of very well-funded and talented law and marketing pros that has had such a great influence on the media and popular opinion, and caused so much damage to the institution of marriage.
It's also already stretched super thin, and relies on corporations willing to fund LGBT activist activities to stay afloat any time any good news about marriage pops up and motivates people towards traditional values. It is literally pushing at peak capacity.
You have no idea what would happen if Christians and other morally minded people as a whole pushed back and were less accepting of alternative sexuality and of immorality as a whole. I believe a major impediment to our nations disappointing tolerance towards "alternative sexuality" would be strong regulation and oversight to the online pornography industry.
Tolerance is great when it's helping people with faults to improve themselves on the path to become better people. People don't heal all at once from physical wounds nor do they from moral wounds. However, tolerance is never good when it's expressed to accept and promote blatant evil. You can tolerate yourself, your neighbors and friends, and your posterity right into hell, if you aren't careful.
Tolerance needs to be realized, not as a universal principle that applies to every situation, but as a tool mercy and love has provided us - it's the leniency we grant to those trying to throw off their natural/animal inclinations to become morally minded and morally acting people.