In hindsight I think the Ancelotti hire hasn't helped us when it comes to this hire. Expectations are through the roof and potentially decent (I'm not talking about Rafael) candidates are being viewed as not good enough.
At the time we appointed Silva he had something like 80-90% approval among blues. Yet Nuno, who is twice the manager Silva is/was struggled to get 50%. Presumably because he felt like a massive come down from Ancelotti.
I also think people need to get past this obsession with us playing like Brazil. Some of the best and most successful teams are built on sturdy defence. In fact - a team of our size and stature us much more likely to get success by going down that route. Look at Atletico. Look at Leicester when they won the league. They didn't play the best footy in the league, but they were incredibly solid, knew what they did well, and executed it to perfection.
Having a manager - be it Carlo, Nuno, Rafael or someone else - who gets us established with a solid base and then pushes us on with better players as we get higher up the table, is likely the way to go. It may not be pretty, immediately, but it's our most likely route to success imho.