I would certainly hope rights for gays would reach equivalency and plateau. However, that does not mean that certain religious or other groups will not stop the persecuting gays. That means maintaining an anti-defamation group like gladd .. even when there are laws, they still need to be enforced. This is true of other minority groups. Injustice does not stop just because there are laws to protect you.
But just as a warning from the past, Homosexuals have been here before. Probably more than these, but here are some from ancient and recent history:
1)Rome/Greece prior to Christianity. There was a time when homosexuality was not so persecuted in the west. It was not uncommon to have a same-sex lover. Same-sex marriage type relationships existed too. Soon after Constantine showed Christianity favor, laws began to emerge against homosexuals .. first same-sex marriage was banned .. then decades later homosexual activity was banned. While selectively enforced those bans carried down through the centuries passed on from kingdom to kingdom causing much suffering for homosexuals since.
2)In the 1920's an early organization dedicated to modernizing attitudes towards homosexuals http://en.wikipedia.org/wiki/Scientific-Humanitarian_Committee
also tried removing anti sodomy or gay-sex laws (like we have only recently won through the courts here). But when the Nazi's and Hitler rose to power. Progress was quickly overrun and much of the research burned.http://en.wikipedia.org/wiki/LGBT_movements#1860_-_1944http://en.wikipedia.org/wiki/Nazi_persecution_of_homosexuals
persecution still continued in various forms and as you may know, it has only been in recent decades that gays have made progress that was initially made.
The moral of the story is that there are always groups out there looking to persecute vulnerable minorities through lies and propaganda. Since gays will always be a perpetual minority (biologically speaking .. we can't purposely create other gays like racial or ethnic groups can) I think they will always run the risk of persecution.