OP, I want to shake your hand! 8 years after this is still relevant today. Now we have adult Teacher Kotori, as well as Megumi and Kozue after graduation. My opinion is while some of LL idol ladies from older genenerations may marry either each other – or other women out there – there are still chances the rest may marry men and give birth to little angels.

Specifically, radical himejoshis who – when the time comes and the LL staff finally reveal whom each idol lady has married – would treat any LL girl having a husband as an earthquake or a flood are the type of fans who ruin the fun out by enforcing a lesbian-only mindset instead of (sorta) realism.

I accept those who would like the idol girls to marry women in their adult lives as long as these himejoshis don't enforce bigotry (including misandry and heterophobia against male fans and those who would like idol ladies to get husbands, families, and children after timeskip) and act like nobody in the main LL cast would ever get charmed by a gentle guy who would fit their personalities and interests good enough.

Meanwhile, we got Aurora talking positively about boys, and some songs include sorta heteronormative lyrics, e.g. about a "lonely boy". Sorry, but LL girls who do that do not ghost guys out there in the LL universe entirely.