Of course I agree with that, but currently I don't know who is a great striker who is worthy of replacing Benzema in the team when Real Madrid only has Joselu as a center forward. I know Real Madrid can bring in the players they are looking for, but so far they haven't done so and have chosen to withdraw from the transfer market.
I think it is a well known fact that Real Madrid did not spend heavily on a striker this summer because they are waiting to sign talisman Mbappe from PSG in the next summer transfer window. and this is why Joselu was signed as a stop gap. Instead, Madrid invested in their midfield options heavily; as they prepare to let go of Modric and Kroos in the coming season.
Although they need a lot of time to make their squad more balanced, but what they are doing now looks to be going in the right direction. First, they brought in a midfielder who we all know that it won't be long before they may be without their 2 mainstay midfielders, secondly, they are holding back a bit from making a big transfer in the next season. Although it doesn't guarantee that they will actually get it, but their current steps lead to it, so it is natural that many of us are speculating like this.
As for Joselu, I see him as a player who I honestly see as their experimental tool, which when he plays really well is good for them, and even if he doesn't they have anticipated this.