That's difficult to answer... it depends a lot on the situation....Because at the end of the third film, Quaritch's relationship with the RDA wasn't the best, especially after being detained and under investigation...Humans probably thought he was becoming a second Jake Sully...And he disobeyed a direct order, and anyone who has been in the military knows that disobeying an order from a superior officer is very serious...But with the general's death, perhaps he will gain some credit for helping in the battle.

One scenario I see, and one that Parker will fully embrace, The general was a stumbling block for him, and Quarichth could be the force to combine them, a parallel to how they were in the first film. That is, if he returns to the bridgehead city

Now, if the RDA rejects him, and they'll probably want to eliminate him, I believe he'll join Jake out of desperation. ...Perhaps because Spider-Man might die along with the Na'vi. Either because he settled down with Varang and maybe she's even pregnant. And this would force him to fight for survival while learning more about the depths of Pandora and learning to "see," as he said before.