I have stopped watching the show completely, but from the updates it is obvious that Adoon will get married for sure.
I think Adoon will be the endgame though Adilie will obviously fall in love. But Imlie being of extremely high standards won't ever ruin her their marriage especially after knowing she is her sister.
Gashmeer had mentioned that he will start shooting for movies in April, so probably his role will anyways be reduced. It is highly likely they get a new ML then or let this story be just about Imlie's journey considering the show's name is Imlie. Gul can make a completely title lead centric show like she made Kulfi. Moreover I don't think she will show Ishti Kutum kinda regressive content in today's world.