I would have said the same six months ago, I do not consider their late season form to be indicative of anything.He won the league multiple times with Dortmund. What you are describing is a likely scenario but not plausible. They have a great team and the players look hungry for more.
Don't go by their end of the league form. Obviously there was a drop off once they won the league mathematically. It won't happen next season though. My prediction is that Liverpool and Man City will again get the first two spots but the points difference between them will be less than 6.
Man Utd and Chelsea will fight for the 3rd and 4th positions and we will get 3rd comfortably.
I follow the Bundesliga closely and quite vividly remember both of his title wins, especially the first one, when no one really took them as serious challengers until somewhere around half way through the season.
However, there are not any obvious parallels between that Dortmund side and this Liverpool one, so not sure why you would bring them up. I did not say that Klopp's style can work only for two seasons, I said that it is such that it could amplify declines.
Generally, it is extremely difficult to maintain the same level after achieving a long-lasting goal. Think of Real in the first season post la Decima. Klopp might well manage to do it, though, we will have to wait and see.
Also, the nature of modern football is such that long-term management is not really a thing anymore and he has been there for nearly five years now. I think everything is in place for their cooperation to turn sour.