It's been left too late now so Ventura will be in charge for the WC - if they even qualify - so at this point qualifying and making it past the group stages is all I'd expect. You can picture it already, it'll be the same lifeless performances you'll see with England under Southgate.
2018 isn't a tournament timed for Italy to do well in anyway, but it should have been a first step towards a more promising future. Ventura hasn't created a balanced team and he's had long enough to do it.