The 43-year-old expects the gap between the division's top clubs and the rest of the league to widen over the next few years
Bayern were crowned German champions on Saturday with six more games to go, following BVB's league success over the past two years and Kahn fears that the gap between the top teams and the other sides will only grow bigger in the next few years.
"One of football's most attractive elements is the unpredictability of results. The tension and excitement about how a game will pan out fascinates all of us. Without this element, football is much less attractive," Kahn wrote in his column for Bild.
"However, the gap between the top, formed by Bayern Munich and Borussia Dortmund, and the other teams could increase even further in the future.
"The current structure in the Bundesliga only keeps the current balance of power in place. A greater emphasis on market openness, transparency and competition could lead to fresh impulses without losing the identity of football."
Bayern hold a 20-point lead over Dortmund in the Bundesliga table, with third-placed Bayer Leverkusen 26 points off the pace.