It's interesting yet saddening to play out the consequences along the path you've outlined. LGBT kids, by definition a 2-4% minority, are unlikely to find other people like themselves. They remain closeted for longer, trying and failing to conform. Their struggle will be unfortunate, but also not measurable.

What will be measurable is the % of youth who identify as LGBT, which will be lower because more of them would be closeted. That'll be a win for people who want to "protect kids from LGBT ideology".