That's a Rafa/Mourinho style 4-2-3-1. I'm not saying I don't like the formation - it's proven to be very successful. I just don't see Rodgers or the present personnel having success with it.
A 4-2-3-1 is about patience, soaking up the pressure, sitting back, and hitting occasionally on the counter - the compete opposite of how Rodgers has always played. The CM pairing of Hendo and Milner are just not the sort who can play that way either. They're both high energy, pressing midfielders.
Re: Lallana as a wing-forward - I think everyone would agree that he's best in a floaty central attacking midfield position than as a wing-forward like Hazard or Bale.
The only one who the 4-2-3-1 suits ideally is Ibe, I think. He'd be an excellent wing-forward.
Benteke could also be good in it actually, provided the rest of the front 6 is attuned to it.
100% agree with everything here. And yes, we don't have the luxury to spend half the season looking for the right formation again. Either Rodgers will get it right away or he'll go.