Dortmund is now 1 point ahead of Bayern Munich. I don't think it's too big. Because if Dortmund loses a point in a match, they may lose the top spot in the table. Bayern Munich is now in a slightly weaker position after changing coaches. If the Dortmund team cannot strengthen the top position of the table in this opportunity, then they will not be able to win the title.
After many years, it is a first season Dortmund can hold the first position after Match day 29 in Bundesliga. It together with a bad season of Bayern Munich, can help Dortmund to win Bundesliga. 1 point difference is small but with only some matches left, Dortmund can again focus on themselves and the title will belong to them if they win all remaining matches.
Bayern Munich's big mistake was to change coach at such a crucial moment. Although Tuchel is an experienced coach, it is very difficult to take charge of such a team. He needs more time to build a friendly relationship with the team players and stabilize the team. And I wouldn't be at all surprised if Bayern Munich won't champion this season. Their performance now is that of an average-quality team.
It's my shock to see Bayern Munich lost big after scoring first. Especially they lost it after were eliminated from Champions League in mid of the week. Likely Bayern Munich will lose Bundesliga too if they continue their unstable form and some times with bad performances.
With bad results from Champions League and Bundesliga, if they end this season without Bundesliga, will Tuchel still be their coach in a next season?