How would you deal with this?

You've been in a band for 25 years, the band is your life. You're about to start recording your third album when your bass player quits. You get a new one but she's only just learning to play however, she starts out being pretty good and you figure she'll get better in a short while but, after quite a few years, she STILL makes all the same mistakes!! Instead of trying to better her playing, she makes piss-poor excuses. Others in the band have quit because of her. You keep telling your singer to get rid of her and get a GOOD bass player! It's his band and he refuses to get someone better. You love the music and helped create some of it so, you don't want to just walk away from it, especially since you feel you're about to hit it big!
What would you do?

How would you deal with this?
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