Stones has said that he is happy at Everton,
Everton say they are not interested in selling the player.
If that situation stays the same then the player stays.
The Chelsea interest in John Stones didn't suddenly happen overnight. Chelsea know that John Terry has a limited amount of time available. They also know they won a poor league last season, City underperformed hugely, Utd very much a club in transformation and Arsenal...were they were just Arsenal , perennial underperformers.
John Stones and his agent will have known about the Chelsea interest for a long time. I am sure they knew about the bid before Everton did.
I think Chelsea have been told that if they reach an agreement with Everton Stones would be happy to join them, but he is also happy to stay at Everton and Chelsea will no help from the Stones camp to push through a deal.
Mourinho is trying some bullying to force through a deal and I wonder if he actually is allowed by Chelsea to spend the kind of money Everton would want. What has been the biggest signing by Mourinho since he came back to Chelsea ? I expect it was Costa and he was already an experienced proven goalscorer.
In addition , I would expect that Utd, City, the Spanish and German clubs may have an interest if the player were to come on the market.