Real Madrid need an out-and-out striker (like Cristiano has been) who is a guaranteed 40-goal-a-season player to replace Cristiano.
Which is easier said than done.
They hardly need Hazard who's doesn't really putting up impressive numbers anyway. Bale (if he can stay fit) is a better player than him.
Do you really think CRonaldo will keep up the numbers for eternity? His numbers already started to drop since 2 years ago. At least in La Liga they did.
Sure, a peak CRonaldo is hard to replace. Not the version that needs to rest every other 2 matches in La Liga and has a terrible conversion rate. Hazard will not replace his goal numbers, that's certain, however he'll add another dimension to RM attacking play by stretching the field and being way more involved in the build-up. Other players will also pick up the slack without CRonaldo shooting every ball in sight. And they'll add more beside Hazard. Why do people keep ignoring this?
Bale will not be sold so what are we talking like he's not going to be in Madrid? It's not like they're adding Hazard and lose both CRonaldo and Bale. They'll only lose one.
If it's a player they'll have trouble replacing it will be Modric. He's the player that makes RM tick. Like we've experienced on our own skin these past years, WC CM are way harder to find.
I'll end this here since this is was off-topic.