Hardly matters if Real still don't come calling for him in 2019 or even 2020, which would eventually "force" him into signing the new contract. Like you alluded to, Real are more likely to go after Neymar or Mbappe because they score more goals and provide more benefits from a commercial point of view. Plus, Perez recently said he wants to get young players who will become a superstar in the future and someone like Mbappe definitely falls into the category as opposed to Hazard who is already 27 years old.