Mbappe 100% wants to stay for another year and leave, that's his stance and we understand it, he has said it literally himself, there is no doubt about that part. The stand points of both sides are decided already, we just don't know what can be done about it.
The decision was on PSG and Mbappe itself. The club can put him on the transfer market. I think that it will far better for PSG to sell him this season rather than waiting for his contract to end next year.
PSG will get nothing if mbappe will be leaving from the club with a free agent. It seems like that manchester united is having very big ambition to sign mbappe. MU has even prepared an exchange deal for mbappe.
I think that this gonna be a very important season for PSG and mbappe. I saw that if all of players in PSG are not willing to see mbappe to leave from the club. I think that's mbappe's strategy caused by he knew that if PSG will put very big release clause for him.
PSG also wants him to either extend or they will sell him, no intention of sending him away for free, so either he extends or he will be sold, that's also understood. But on this case, what could PSG do if he doesn't leave? I mean if he refuses to leave, then there isn't much they can do about him, just bench him all year long? I do not think so, fans would be mad, the whole world would question that. If he wants to stay one more year, PSG will have to stuck it up and just let him play for another year and then leave.
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The only way to let him stay even longer or terminate his contract. Just put him in the bench will be enough. I think that if mbappe will be threatened not to play in upcoming season and he will think for twice to stay even longer in PSG.
PSG will be on very big disadvantage if he stays even longer caused by PSG will lose ability to sell him for big money.