The parents will just send their kids out of state. There are "conversion camps" all over.
Last I checked there were conversion camps that will kidnap your kid in the middle of the night and ship them off to like Jamaica. I might be confusing them with just "normal" camps for troubled teens, but last I checked there is very little difference between conversion therapy and the torture they do at those other camps.
Still one small step against this conversion therapy crap is a start.
This story was available on a news site in my country. Despite gay marriage and everything being legal here, the population in general is enormously homophobic so the comments were a bit depressing. However, I think my favorite quote from the article was: "Opponents said the bill encroached on the rights of parents to make choices for their children. They also said politicians should not regulate what they considered to be a matter for medical boards to decide." I just love this because these are the same people who would support bills that usurp medicals boards and require unnecessary ultrasounds and such. Not to mention that this bill has the backing of just about every reputable medical society in the world.
Link to the local article if anyone is interested.