I get You Hist. However, I think players with such characteristics are too rare and too expansive to sit on the bench. Whom could we get, Baselli?
Moutinho, Kovacic, Tielemans, Inler, Alonso, Xavi, Gundogan there are many options.
You can spend big on someone like Moutinho and make him compete for the starting position with marchiso. Chisio could also deputize for Pogba or Khedira. Plenty of time for all.
You can spend but not as big on a very young prospect like Tielemans and use him as Marchisio's sub. As a non-starter you can ease him in and he wont have to deal with insane pressure and could be a long term solution for the problem. Overpaying for him to get him to come now is not a bad idea in my opinion.
You can spend peanuts and get a veteran like Alonso or Xavi as a very short term solution until something better opens up.
You can spend a small amount to get someone like Inler who would be okay with a sub role and knows how to distribute.
Again, a vice marchiso doesn't have to be the second coming of Pirlo. He just needs to reliably pass the ball around, find his team mates when they need him and be good at organizing the midfield. As things stand, Marchisio gets injured and we get screwed again an return to the disconnected midfield of earlier in the season or at least pogba would have to be dropping deep next to fucking hernanes.
Same thing if Dybala gets injured.