If PSG win the champions league I think they'll let him go this summer, if they don't, they'll probably hold on to him and lose him on a free.
If they win the CL, we should be sniffing around incase Madrid can't afford him.
6 year deal keep him 4 then let him go to Madrid.
If he doesn't sign a new deal and it looks like he wont, then hes pretty much nailed on for Madrid. For him to come to any club in PL, would mean that club would have to tear apart their wage structure and give payrises to their current stars. If PSG did win the CL then he might stay who knows?
Ideally he wouldnt go to Madrid or Barcelona ( if the latter had the money) and would make a legend for himself elsewhere. Going to Madrid or Barcelona means you will be compared to CR7 and Messi. Thats a ridiculous ask.
His options are limited though. Not many clubs could afford the fee (would still be circa £100m this summer) and the financial package. His advisors arent stupid, they know his worth and he wants CR7/Messi/Neymar money. Only a few clubs can pay that: PSG, City, Chelsea and Real Madrid.