Possible everything can happen but not mean that Dortmund can find coming final against real Madrid easily to win it will be very difficult for them to overcome real Madrid. Because they cannot compare performance of real to Dortmund, everyone knows how their so good and very strong this season so predict that Dortmund can surprise people's by defeated real Madrid I think is very early to predict that, But shall let wait and see what can actually happen on Saturday between the real Madrid and Dortmund.
I fully agreed that anything can happen in the world of football, but so Dortmund winning Real Madrid is just fully based on luck because they are not in great form like Real Madrid, so everyone is aware that Real Madrid is the favourite team to win the matches because they are in better shape than Dortmund. Why I believe that Real Madrid will win this match is because the team is more experienced in the Champions League than Dortmund.
If Real Madrid can really scape Manchester City and Bayern Munich, I don't think Dortmund should be the team that will stop them from winning this season's Champions League. Real Madrid has everything to win the match, but as you have said, let's wait and see what will happen. Maybe a surprise thing will happen, as some people are expecting.