If Haaland were to move to Bayern it would be a truly spectacular transfer. Then I could easily bet on who will win next season in the Bundesliga.
When it comes to Bayern's dominance, it is a bit boring to see their victories all the time. However, I think other teams should strive to be as good as Bayern. Weakening Bayern would certainly not be good for football in the Bundesliga.
I do not think that Haaland wants a move within the nation, he wants fame and fortunes and Bayern is not a team like that. Look at what happened to Lewandowski as an example, dude was clearly the better player but still lost that award, why? Because Bayern is not a flashy team, they do not get as many viewers as other big clubs. Real or City gets so much attention, even PSG gets more these days.
I feel like if PSG realizes that they are going to lose Mbappe, they could clearly afford to pay for Haaland and get him. In that case I do not think that it would matter, they would have Haaland instead of Mbappe and that could basically be no change for them, they would stay at the top.