The presence of MacAllister and Szoboszlai is expected to cover Liverpool's midfield deficiencies next season. As a result they have ended up together with several players such as Chamberlain, Keita, Fermino and Carvalho playing in the same position. As you said fit also looks like they still need two or three more players to start next season, if all goes well for Liverpool I think they can finish in the Champions League Zone next season.
Klopp's major problem from last season was creativity from the midfield and he really wants to change that. I feel their midfield is okay right now but they need an additional player for quality squad depth.
Liverpool will be a contender for the league next season. They will continue on the form they ended with last season. The players and coach are very motivated right now so they will be ready next season. Liverpool will most likely not go without a trophy next season.
I'm looking forward to seeing MacAllister for Liverpool. I really enjoyed him at Brighton and he was superb in the world cup. I love intelligent midfielders and MacAllister is not only intelligent, but he's also a worker, the perfect player for Klopp's system.