I understand it's very possible that Liverpool and Leverkusen may not get to meet in the finals but then I don't think the council in charge of Europa would want that to happen because they know how well the anticipation on Liverpool and Leverkusen meeting in the finals has been on most persons an how much view such finals nis definitely going to get and that alone will keep attention to the Europa till the end of the Europa, except either of these team naturally happens to exit before the finals I think it will be best to allow them meet in the finals and the best teams should win.
Honestly, I don't really understand why you doubt Liverpool and Leverkusen to be in the final round? You know most people really want to see these teams in the final round because they are the most consistent teams in UEL. The final will be interesting if both teams are equal and they are in the best performance during this season. I don't see other teams that have better performance, Italian teams are good but they played very unstable this season. AC Milan, AS Roma, and Atalanta aren't likely to be in the final.
I'm aware the Italians would want to try their best such as AC Milan would ant to contend so hard but this season isn't looking like one of such season where they can actually just come and hope to achieve such as the pressure and competition that will be seen in this season will actually be quiet different from that which has been seen in previous Europa where the Italians were able to show their prowess.
Every team must do their best in UEL. Italian teams are well known with their good defense, but the teams from other leagues are also strong. Leverkusen and Liverpool showed it well in this competition. Although Liverpool ever lost points in the group stage, it looked like they didn't use the main lineup. Meanwhile Leverkusen have performed perfectly since the group stage, they never experienced a single lose. Considering this fact, I've no doubt with Liverpool and Leverkusen.