Will just paste my deleted post from the Inter general stuff thread cause people rarely post there but your post is a fit answer to what I wonder:
Would you stick to 3-5-2 and have Limone stay or search for similar coaches that play this formation, or ditch it and start all over again?
I think sticking to this formation makes no sense with average wingbacks like Dimarco, Dumfries, Darmian etc.
In theory it's a good formation. The midfield is packed with different types of midfielders and you have wing backs running up and down the pitch to both defend and attack. But it's not all that simple to make it work. It's not a surprise that few elite teams, if any, use it. There are Conte and Limone religiously follow it but that's it. Other guys like Tuchel, Potter etc. play with 3 at the back sometimes or more often but a bit different, 4 in the midfield and 3 upfront or some other variation of this.
What would you (ideally) do?
I have expressed my opinion on this for a while. If Inzaghi isn't at Inter next season then it's time to ditch back 3, especially if one of Skriniar and De Vrij leaves at the end of the season. Sticking with a back 3 to bring who? Juric? Sticking with a back 3 would limit our coaching options a lot. I can understand going for a back 3 when you hire a top coach like Conte but sticking to it only because players are familiar with it makes no sense. We don't have the right personnel for it anymore. We need a fast ball playing rcb, a starting lwb (potentially one for the right side too), a starting forward to pair him with Lautaro. And this doesn't even include our needs for the bench (two side cbs, 1-2 CMs, backup forward, backup ss). And that's only if we don't sell any starter else we could need even more.
So even if we decide to stick with a back 3 it's not like it's gonna be cheap either. Squad needs a rebuild. Even if we chose to extend all our veterans we would just delay the inevitable.
I know people will argue signing wingers will be expensive. I hear you. Therefore, the transition could be gradual by switching to 4-3-1-2 at first. We don't even need that much for the formation.
Onana
Dumfries - Skriniar -Bastoni - New lb/Dimarco/Gosens
Barella - Brozovic - Hakan
New AM
New CF - Lautaro
We would buy a player for the left and a forward for 3-5-2 either way so the extra addition is just an AM. Instead in cbs we would only need backups.