Real Madrid's goal was to get Mbappe or Haaland in the squad. However, Haaland has joined Manchester City, and so Real Madrid will not be able to sign Haaland in the next few seasons. Mbappe, on the other hand, is probably not interested in coming to Real Madrid. Real Madrid should find a replacement for Benzema now. Even in the last few seasons, Real Madrid has relied solely on Benzema's performance. If Benzema doesn't play well next season, I don't think Madrid will win any titles.
Name the club that can fight Real Madrid in La Liga?

Even if Real have some less effective striker instead of Benzema? I think that the next season will start with the fact that the bookmakers will quote the Real championship as 1.3-1.4.
Vinicius - Benzema - Mbappe look perfect but Lewandowski instead of Mbappe hmm not sure if that will be good for Benzema since his role will be to assist him like what he used to do with CR7.. After this excellent season for him, everyone will think that he dropped in performance.
If Benzema isn't positioned as a CF, doesn't mean he only can give assists. It is the same as when he is positioned as a CF, doesn't mean he is only ordered to score by the coach. A CF also needs to deliver assists if another player has a better position to score. And there are many wingers that have more goals than CF, Son and Salah are the best example of this, both of them aren't Centre forwards. So if the formation: Vinicius-Lewandowski-Benzema, won't decrease the goal productivity of Benzema since he still has the same chance to score as usual. Of course, he still can have another amazing season like what he did in this season, don't worry.
In any case, instead of one striker, which in the coming years will require replacement, having two is an extremely bad idea. I would not even think of such a trio, although if you take these players in their golden years, it would be one of the best combinations in history.