Florian Wirtz seems like secured for Leverkusen for at least next season. Normally it wouldn't be much possible but Xabi Alonso effect changed everything for Leverkusen. They started to believe in themselves to achieve any title available.

Therefore I also think Wirtz doesn't need to leave already now. He is only 21 years old as well so there is no need to rush while doing wonders with his team.
I see no reason for wirtz to leave from leverkusen at this moment. He can still play there under xabi alonso. There have been a rumor about real madrid to have an interest in recruiting him in the upcoming transfer seasons. Why desn't he wait for real madrid instead of join in the looser club? Leverkuen is also playing in the UCL next season.
He still needs to develop his performance in leverkusen. Im willing to see him to stay there for another season. It's been rumored that madrid will be keen to bring him and xabi alonso to the santiago bernabeu. I hope this gonna be real.
not sure whether Madrid really wants Wirtz next season because currently Madrid already has very complete and very quality players without needing another midfielder, but if the reason is to replace Kroos, it looks like Ancelotti won't worry because there are still lots of talented players Madrid has Brahim Diaz who is ready to replace Kroos.
even though Brahim Diaz does not have the same skills as Kroos, at least Diaz skills can make a big contribution to the team to continue to achieve prestigious achievements in the future.
what is certain is that this is all just our speculation and we all don't know what will happen in the future, but I would like to guess that Wirtz will not join Madrid.
and regarding Xabi, perhaps it is more likely that his arrival will be expected after these two seasons, Ancelotti will definitely decide to take a break and leave Madrid, while Xabi, after having a good experience with Leverkusen, has greater ambition to try a challenge with a bigger team and perhaps join Madrid a challenge that Xabi will accept.