I think we all knew Samsung would leave google, even I recall admitting to that. However I said, this would be done by also licensing the play store on the risen platform. They need something to help drive their platform, the only thing that can do this is a vast array of apps.
Also you make it as if google rely on Samsung. Once this break up occurs, watch how HTC, LG and Sony will start being more successful. Samsung is too cocky for their own good. If they don't get the licensing for the play store their ecosystem will crash. If you look at reviews, you will see the HTC phone is generally praised more than the Samsung alternatives. HTC even though losing revenue the last few years will creep back up. And. LG well they will be the new android king