But at the moment it is easy for Bayern Munich to overtake union Berlin and Freiburg who are currently ranked 1st and 2nd. Moreover, Union Berlin has just suffered its first defeat which means they are not strong enough to maintain their position at the top of the table. Bayern Munich is too dominant in this Bundesliga so it is not difficult for them to return to the top of the table as usual.
I do not think that anybody is expecting either Union Berlin or Freiburg to win the league from bayern, the two of them are doing very well for now and they occupy the top two positions in the league table, but it cannot be for so long, the team that can win the trophy from bayern is Dortmund, so for people that do not want bayern to win the league again, they have to hope Dortmund get into their best form and climb to the top of the table, but Union Berlin and Freiburg can't take the title from bayern.
With the quality of players Union Berlin and Freiburg have I'm sure they won't be able to win the Bundesliga trophy. Because it is difficult to expect
Union Berlin and Freiburg to play consistently until the end of the season with the majority of mediocre players in their squad. Evidently Union Berlin
finally suffered their first defeat against Frankfurt, it is very difficult to hope for Union Berlin to end Bayern's dominance in the Bundesliga.
As you said, Dortmund are indeed more worthy as Bayern's competitors to win the Bundesliga trophy. The problem is that Bayern is too strong
when compared to other Bundesliga teams, including Dortmund, the quality of the players is still below Bayern. Actually if Dortmund didn't sell
the star players they have almost every season, I believe Dortmund can win the Bundesliga and end Bayern's dominance in the Bundesliga.
Moreover, it has been seen that Bayern began to improve their performance when they beat Leverkusen with a very large score, then continued
Bayern also beat Viktoria Plzen with a much bigger score in the Champions League. If we see this, I'm sure Bayern will slowly return to the top position.