Interestingly in the Champions League there are no teams that can always dominate. Except Real Madrid is only able to maintain three times in a row and of course it will be very difficult to materialize again.
We usually understand the long run in tournaments. Dominating depends on the club strength, we noticed the long run and the clubs necessary for the long run. UEFA Champions League is mainly for serious clubs, we're talking about clubs that fight for major spot in tournaments and their stats are extremely placed ontop. Real Madrid happen to be the top ranking club in the world because they've won the major trophy with ease.