No wonder you think that the Bundesliga is a boring league because Bayern Munich's dominance here is very high. I too am one of those people who think this league is boring for title fights. I prefer to see the Bundesliga in competition for the top 4 positions, because the competition there is still a lot of teams that are able to provide competitive competition.
You are right that Borussia Dormund is a team that can actually put great pressure on Bayern Munich. But if they continue to only think about money then they will never achieve great success in this Bundesliga.
Bayern Munich is unanimously dominant power of Bundesliga with in last few years there was some competition from Borussia Dortmund but in this season after poor start they are again at the top of league table, but Dortmund is badly struggling due to bad decisions and injuries issue hopefully they will try to fight back after having suitable replacements in January window but in this season we have positive change with few teams are doing good job and having fight for the top ranks like Freiburg, Leipzig and Frankfurt which mean things are improving which is good change.
Union Berlin which was leading table now at fifth spot hopefully they will also try to come back at top ranks even now it's tough time for them with they need to increase quality and performance which is not possible without few quality players, but surely things will be changed in coming days for the top ranks which is good.
I have seen a lot of people argue that Bundesliga is not very boring. This is because the other teams, except for Bayern Munich have a lot of competition running on between themselves. Some people really do not want to understand that that main target of a competition is to see which team is the winner. And if everyone knows who is going to win, it is not much of a competition at all.
When we know that Bayern Munich is going to win the Bundesliga title, it instantly takes away 60% of the fun, and it also instantly becomes so boring. This is not feasible to be fixed unless the other teams become improved, almost at the same level as Bayern Munich.