I would hate to only go for Pjanic, but then again, Conte won Serie A with a bunch of spent cartridges alongside the Hakimis and Lukakus. We have quality in the team, it's just very young and need more experienced players in the pitch to control the tempo, that's probably why Allegri wants Pjanic. If it's a free loan and the team pays little in wages, I don't see why not try him there and if it doesn't work out he can be sent back to Barcelona. We were also obviously dying for a prima punta in the last game, with Kean there and perhaps Morata to his left the attack would actually be more efficient, there was nobody in the center to tap all of those crosses in.
Let's have a bit more optimism, the squad isn't bad at all and Allegri is one of the smartest tacticians around. The results will come.