The only "what if?" scenarios are for Josy, we haven't seen her at B&R without Maya so everything we say regarding that is conjecture.
However we do have Maya at B&R without Josy, we know exactly what her plans were if Josy wasn't at college. At the point Maya asks Fuckface for his help with her pledge list she assumed that Josy wasn't going to be at college, and that they were about to break up. So we see exactly what Maya would do if Josy wasn't in the story, because up until Josy turns up at B&R that was Maya's situation.
Therefore we can say with 100% certainty that Maya would do if she had broken up with Josy (or any random girl) before she arrived at B&R and therefore was a single lesbian. That's how she sees herself by the time she asks Fuckface to do the list, so if that was her actual situation she would pledge for the HOTs and give Quinn the evidence with which Quinn can then blackmail her into being on the restaurant menu. That's not conjecture, it's simply fact, yet you've decided despite the story showing us what would have happened that something else would happen.
Because Maya LOVES Josy ! Her dad already caught them before college and she made the decision to still be with Josy, and Maya didn't do anything to emancipate herself from her dad. That's the closest "proof" we have what Maya would do without Josy and even that is iffy at best.
And if a person is willing to tough it out even though she has someone she loves in her corner, what do you think she would do without ?
If you remove Josy, her dad wouldn't know that Maya is a lesbian or later on bi, and Maya would no longer have a tuition problem and the HOT's would be just "a bunch of sluts".
Everything you claim as facts, are facts while Maya is with Josy and in love with Josy, so it has zero relevance to what Maya would do without Josy.
The only way to take an educated guess at what Maya would do, is to look at how she is characterised in the game and all she ever does is pout and wait for someone else to tell her what to do, so claiming that she, out of the blue, developes some initiative is highly questionable at the very best.
She surely didn't do anything to emanicipate herself from her father in the 6 months leading up to college and that's in the inet age, where it literally takes all of 5 seconds to google something and then act accordingly. She doesn't call her money lender, she doesn't go to the financial aid office at her college, she doesn't call her bank or go for a free lawyer consultation.
As of now, if you have to pick the two characteristics that stand out the most with Maya, then those would be dependency and inactivity.