Union is very consistent right now. It seems like union has a main aim to take the domination from bayern. I really support union to be a competitor for bayern. We were always seeing bayern have been dominating this league for almost 10 years which is a lot for me personally. I hope that if it's not only union but another team will be also doing the same thing like that. That will push bayern to be consitent for the upcoming match against any team in the bundesliga.
I think it is very questionable whether Union Berlin can become a real competitor to FC Bayern in the medium term. The roster is simply too weak for that and I think the longer the season lasts, the further Union Berlin will move away from the top of the table.
But of course you're right that the Bundesliga and Bayern ofc desperately needs real competition again. After ten years, it's simply time for another team to win the Bundesliga championship - even as an FC Bayern fan. So far, Bayern has always been at its strongest level when they had strong competition in the Bundesliga. The stronger the opponents, the stronger Bayern when playing international teams.