Acting Lessons wasn´t extremely long, adding chapter after chapter after chapter, soap-opera style (like Dating My Daughter, for example) until nothing from the original plot left. Acting lessons was a successful game and the dev could have make it way longer and milk the patrons for more time. I assume BaDIK will not be extemely long either, and will finish with the ending of the school year.Summertime saga and Dating my daughter have been in development and production for 5 years and regularly release updates. And they will be developed for another 2-3 years. I don't think that BaDIK will become a record holder.
I suppose the main climax of the game will be the coming to light of the drugs and prostitution ring in the HOTs. I imagine that at some point the MC will has to choose between helping Quinn or helping Sage, since it seems clear to me that Quinn is already using and manipulating Sage now, and will not give a second thought if she has to put the blame in her, as president of the HOTs, and saving herself when the ring will be exposed. In my mind, that will be the main drama of the game and what will determine who gets a happy ending and who don't.
Maybe will be a "BeDIK II, second school year", if the dev earns money enough with this game and don't get sick of writing for those characters, as happens a lot of times with scriptwriters (that's the main reason why there is no a "The Witcher IV") and wants to make something totally different. But ther will be different, with new characters and plots.
My 2 cents.