Don't agree sadly, I don't think we're well set up for a back 3 at all. The only centreback we have who is comfortable in a back 3 is Godfrey - both Mina and Keane prefer a low-block back 4, and Holgate is awful in every system.
As for wingbacks, the only player we have who can play this role at a good level is Digne. Coleman can't run and Nkounkou is completely untried. We'd need to sign at least 2 right wingbacks this summer to play this system and hope that Nkounkou is good enough to deputise for Digne.
As for midfield, Allan and Doucoure are okay for a midfield 2, but, where's the creativity coming from? Neither of them are particularly good on the ball. Gomes is crap and Gylfi doesn't have the legs to play in a midfield 2.
Forwards... will Richarlison even be here next season? And if he is, will he be as crap as he was this season? If James goes, we'll need to bring in 2 quality right-wingers.
This is the problem with NES, he seems to like this 3-4-3 system, but we have 1 good fullback in the entire squad and our centrebacks are crap on the ball. We'd need to overhaul the squad to make a 3-4-3 work, and then what happens when NES gets the boot? We bring in a manager who probably doesn't like 3-4-3 and we need to strip the squad and start again.
It's a depressing conundrum whoever we appoint.
I would tend to disagree with some of this.
Mina, in particular, is more than capable of playing in a higher line (did so for Columbia this weekend) and is decent enough on the ball to play in the middle of a back three. Godfrey we all know how versatile he is and nobody would have many worries there. Holgate, despite having a nightmare of a season, has played most of the best football of his career in a back three. Ok, I wouldn't necessarily want him starting all the time, but he'd be useful to keep around. We don't know enough about Branthwaite to decide if he'd be ready to be included in the conversation yet. The only one we could probably definitely agree on there would be Keane who has shown time and time again how limited he is in a high line.
Digne I wouldn't have too many concerns about in this system, it would probably help Nkounkou's development as well as the defensive side of the game seemed to be where he needed most work. On the right, Coleman could provide cover but yes, we would 100% need a new right wing back (but the same goes for a right back if someone comes in who plays a back 4)
In midfield, I don't have any worries about Allan at all. Doucoure also has a great engine, but Doucoure worries me in a two as he seems at his best in a midfield three with licence to bomb on. Gbamin we don't know enough about (although every time I watch a YouTube highlights package of him, I worry he wasn't going to be a great signing anyway), Davies and Gomes most of us would agree that we could improve on, so I do sort of have reservations in there, but again that's probably true regardless of the system we play
In attack, Richarlison and Calvert Lewin would be great in a 343, should suit them both (that goes for Potter's version and Nuno's). Not so sure about James, but we still need to sign a right winger (ideally a left footed one) regardless of what happens with James this summer.
I don't think we are miles off being able to play that sort of system comfortably, but I think my main point here is that whether you're playing 4231, 433 or 343, the same weaknesses exist in the team anyway so it shouldn't really matter *that* much which system the new manager wants to play, the signings we make to address the weaknesses in the squad would probably be similar anyway