People do know about it, its pretty well known. Also, Emily might be the only character getting an ending, but that doesnt mean the other characters wont get scenes, there are already multiple scenes with Ashley and Samantha, and promise of scenes with Ashlyn and probably kuneida too.
I dont understand why people pay so much mind to the fact that only Emily will have an ending, its so strange to me
It's hasn't been confirmed yet, but last I heard the dev was considering an Ashley ending, so there is a chance there is more than just one ending(Emily), just not confirmed.