Let's have a look...

I see a
Real Madrid - Liverpool semi final draw already there.

Nobody to stop Liverpool until then. PSG destroyed Brest but we are talking about Liverpool here. PSG aren't strong enough to eliminate them surprisingly.
On the other side, I believe the semi final matchup would be
Barcelona - Inter. It would be such a tough one to predict. I don't want to underestimate Inter. I assume Barcelona would make it by close margin then.
And an El Clasico in the finale... This is my prediction for now.

The first thing that came to my mind when I looked at this picture is the Real Madrid - Barcelona final. Actually, another option is that on one side in the final there will be either Real Madrid or Liverpool, on the other side either Barcelona or Bayern. This is what I see at the moment, maybe some surprises await us, and Liverpool has already beaten Real Madrid in the group stage, and Barcelona's game doesn't always go well either.
There is a chance of a final like you said happen, but as far as I see the final match you mentioned above, it looks like you are more optimistic if Madrid will fill a place in the final match later than other existing teams, besides that from the teams you mentioned above precisely is dominated by a big teams and it gives me a sign if you see a team advancing to the final only based on the big name of the team, Come on guys this is the UCL competition and last season should be an experience for us not to underestimate the existing dark horse teams, when the knockout phase begins, it is difficult for us to say if the chances of the big team qualifying are far greater than the small teams, so indeed we often see surprises that occur in the UCL like last season when Dortmund reached the final, didn't we underestimate them from the start because of the poor performance they had in the league?