I think Stones and maybe Mori in a few years time will be invaluable to the team if the rest of the squad continue to learn how to work off the ball so a footballing centre half can find them.If John Stones has no say in the matter, then fine, lets keep him. But you and I know football does not work like that, and we will lose him at some point.
Defensively, as a unit he does not make us any stronger than Jags & Mori/Distin. Individually he is magic, but the unit/team is the priority.
And decent players will want to come here.
Stones will have a say but as has been proven the determination of the club will matter. Good players have and will stay much longer than expected when richer clubs have come in for them. We don't have to accept anything as inevitable.