As I mentioned a few times with Shasha I am hoping for the love of everything that her quest line will become one of the longer questlines for two reasons.
1) You end up giving up Sarah who if I were to guess next to Rachel has the largest questline out of everyone, not to mention if I know BON will make it were several other questlines will tie in/continue with hers.
I mean so far Sarah's questline next to Rachel's has the most character tied to it seeing as Sarah ties in, so to give up someone like this the pay out in my opinion needs to be worth it.
2) She as I mentioned is in my top two with Amy being above her. (While I do like Shasha's model and uniqueness, Amy had her beat due to me not only liking her model better, but her also being a redhead.
As for Carol and Laura I want to see the later's chain extended as well and as for Carol BON really should add a virginity lost since with her along with Mindy, and Brenda.
See, that's currently one of my worries about Shasha's content. Like you, I hope her questline is a long one given she's supposed to be the alternate choice to Sarah who you could argue is one of the main characters given how long her questline is and how many characters are tied into her route.
That said, the game is far along enough to the point where I'm worried BoN might not be able to develop the existing content to mesh with the Shasha questline. Sarah's route had been developed throughout several updates while Shasha's has stayed in limbo. I'll be quite disappointed if Shasha just becomes a house visit after choosing her and nothing more. I mean, I'll be happy with her sex scenes probably, but disappointed if Shasha's route doesn't offer the same or similar amount of content Sarah's does/will have.
Although I have speculated that Shasha's questline might be tied into the Dad's questline. Like, if you choose to support Dad instead of Maria. Of all questlines, Maria + Sarah have the longest ones so maybe BoN plans to pair up the pathways based on choice like Maria/Sarah and the Mob/Shasha. I sincerely hope that's not the case though since my ideal route selection would be Maria/Shasha.
All of this is just speculation in the end though. I just hope when Shasha's route does come out it's lengthier to match with Sarah and give players a good reward for choosing her over Sarah and that Shasha's scenes play nicely.