It turns out that there is a recent update regarding the transfer of Mbappe, according to Josep Pedrerol who is a Spanish journalist who got the leaked news from a Real Madrid insider, that Mbappe's move will be realized in August 2021. If these rumors are true, then Ancelotti can find a replacement for Ronaldo. Because Madrid do need a striker who can help Benzema up front. It looks like Ancelotti will play Bale, Benzema and Mbappe on the front line. This will make Real Madrid victorious again in the 2021/2022 season.
I believe Bale is still questionable, I am sure they can find another player if Mbappe comes in. I still think that they need to revitalize the whole team and not just one place, Mbappe also played at striker position way too much, he could definitely play at any attacking position because dude is great but if he ever comes to Madrid I believe he will slowly replace Benzema at the front, I know benzema is a great player but he is not as good as mbappe and certainly nowhere near his age so it would be smarter to keep Mbappe happy.
I still do not think that it is guaranteed deal, we need to wait and see how it plays out because there could be problems with the transfer but if it is actually done, I would say get two players being Mbappe and play him at striker, that shouldn't really be that impossible for real, maybe not this season but next season they should have two great players. For example Salah is said to be upset at Liverpol, can you imagine getting him as well? That would make them the most lethal team in the world.