Lots of people have been force-speculating this narrative that Jimmy slowly becoming completely amoral is what's going to drive her away, but Gilligan and company have continuously bucked that perception at every turn. He's not "corrupting" her, she's always had this in her. Jimmy's scheme might encourage it, but she takes the initiative in many of these instances. And makes the effort to go the extra few miles when Jimmy isn't on that wavelength.

I'm going to be willing to say that Kim is going to be the one to turn Jimmy into Saul through her own machinations.