The thing is, do we have the personell to play 3 at the back?
I just don't think it'll solve the problems that we have. Let's say we play 3 at the back, like we did largely for the 2nd half against Wolves. We'd still be reliant on our wing backs in staying wide, giving us some width and giving us some quality in the final third. Who do we have in the squad that can play those roles and bring that ? On Milner perhaps has anywhere near the required quality in terms of attack and defending. Clyne is a sturdy defender but very limited going forward - that's obvious already, and it'll be highlighted even more as a wingback. He'd probably be better off as the RCB (like Azpilicueta). Moreno can't defend or attack and shouldn't be in the team in any position. Then there's the young lads who clearly aren't ready. Why would you ask them to play in an unfamiliar position when they aren't quite up to the grade even in their
best position? You might suggest that perhaps Mane could be our Victor Moses, but why give up a good thing? Mane was doing just fine as part of a front three, it seems silly to mess that up and then ask
our best attacker to perform more defensively, when our issue is that we cant score enough goals at the present.
I imagine we'd pair Firmino with probably Sturridge, and play Coutinho in behind. Where does Mane go, if not at Wingback. If Mane is up front with Firmino as a wide attacker, then what's the point of having wing backs when you've already got Mane providing the width? Then there's the problem of Lallana. At the moment, he combines extremely well with Coutinho, Firmino and Mane in the advanced areas. If he occupied that CM role then we'd be asking yet another very accomplished attacking player to be doing more defensive duties - makes no sense. A CM pairing of Hendo and Lallana just wouldn't provide the necessary shielding for the back 3. We'd be constantly overrun in midfield. Yes, you could play Can, Gini or Lucas alongside Hendo but then there's still the problem of accomodating Lallana or Mane somewhere. For me, it ends up with the side being very unbalanced.
I think a better solution is to stick to the system that we had when we were winning plenty, make a few tweaks in terms of encouraging a bit more off the ball movement and pressing, and see whether we can replicate what we had. Ultimately, we'll need to bring in a number of signings across the pitch to provide enough depth to contest more than 1 competition at a time.