One more thought:
I've always had a feeling that the reason the Beatles broke up was because Paul was out-writing John. I don't think John could keep up with Paul's musical output anymore. I also think John suffered a musical decline when he started experimenting with LSD, alcohol and other substances. I think he was more living life in general than Paul who was actually really focused on making music.
So maybe in a sense, Paul broke up the Beatles - but not intentionally. It's just that the delicate balance of the group was disrupted. You couldn't have one Beatle outperforming the others without upsetting that balance.
Too, I think a lot of fans wanted more Paul songs - pretty, sweet, melodic, tuneful, simple, positive, feel-good style.
They probably didn't like Taxman, Rain, I'm a loser, Norwegian Wood, He said she said, Tomorrow never knows, etc. Those songs were too deep for them. I'm not saying fans didn't like them but Paul's simplicity was probably more appealing in a universal sense to fans who liked to hum and sing along to Beatles songs.
So the Beatles disbanded and would have done so even without Yoko, I think.