If only he (and his agent) would value himself more like that and stay realistic in their wage demands. I feel like those comments made by Laporta and Xavi about Dembele having the potential to be the best player in the world have come back to haunt us. I get what they were trying to do, and I get that Xavi really likes him (and in this form he is really easy to like and excite you, but it's easy to get over excited, especially in this day and age, when the overreactions based on one game about players are ridiculous).
And with these types of personalities it's better to undervalue and make him work for the praise, not the other way around. For 8-10M per year and a shorter three year contract to stay careful regarding his injuries, he's worth keeping, anything more he just isn't worth it. Maybe those reports about him wanting 20M are false, but I'm sure he and his agent won't accept anything less than 12M per year, probably even closer to 15M, not to mention the ridiculous signing bonus or whatever else add ons he and especially his agent are looking for. We can easily get another good system player (Raphinha) for the money Dembele was supposed to take, if he didn't overrate himself.