All of Dortmund history and their stay player move to Bayern but Hallad maybe except because he want try with primer league or La Liga have more competitive than Bundesliga.
Is there a statement from him to leave Bundesliga because he wants to go to a more competitive league? If he never stated it, his chance to move to Bayern looks quite big. Don't you hear a rumor saying Bayern striker (Lewandowski) wants to leave Bayern in the next transfer window? If Lewandowski really leaves Bayern, who will replace him? I can say 100% the next Bayern striker is Haaland.
If you follow the rumors, you should have noticed that the latest "current" rumor is that Bavaria is not interested in Haaland, but wants to renew Lewandowski's contract. I do not know if it is worth seriously discussing the rumors and how true they are, but I would be glad if Lewandowski stayed in Bayern for the rest of his career.