Conte should start the back 4 now and then continue to work on it's mechanics during pre-season for 2020/2021. He's paid to manage the squad, not enforce 3-x-x.
That won't happen. Conte is a stubborn man, as he showed in all the teams he coached.
Honestly, with him I've seen the best football this team has played since Mourinho, and I think there's a few reasons we're playing like shit atm.
1- Injuries and rotations: Conte's scheme is too rigid and pragmatic tactically speaking and his tactics rely a lot in practice and repetition. At the beginning of the season he showed what he's capable to achieve with a team he created, not inherited. Our squad depth is crap and you can't ask Gagliardini to do the same Sensi did, also, rotations are detrimental for the same reasons, it affects the chemistry between the players, affects players roles... One simply shouldn't fix what isn't broken. We barely rotated the team at the beginning of the season, 2-3 subs TOPS, now, it's mandatory to rotate as we play every 3 days.
2- Mental block: Is not a coincidence that this performance decline has been happening in the last 3-4 seasons, do we have the right players in that aspect?
3- Coach meltdown: this is possible too, Conte is a difficult character, maybe he lost the dressing room, which I doubt, but, regarding from the his statements after the match, I smell something is happening and affecting the performance.
As much as I hated his appointment and hate his stubbornness, I must admit that we played great football at some point.
Maybe we don't have the squad we think we have.