I think the difference between the Bundesliga and the other three top leagues Premiera Division, Premier League and Serie A is that even if you have a dominant team for several years in the latter, it's not structural. You have other teams that legitimately can claim the goal of becoming champions and that is backed by their resources to be able to assemble great teams in the long run. Despite Juve dominating the Serie A many years, Inter and AC Milan would have never accepted being just second best as the status quo.
Even when Barcelona was dominating Real Madrid big time, Real would have never accepted just to be there when Barca has a weak year. You could feel the rivalry strongly on and off the pitch, maybe more than ever. Compare that to Dortmund after Klopp...
And yes, transfers between the two are few and far in between and when it happens it's a huge topic such as when Figo went to Real and not just business as usual. Even Tottenham which is a second tier top team at best would refuse to sell to man city.
For the same reasons I cannot see any other teams bar PSG as real competitors in France, even if they become champions every now and then like Monaco and Lille. Monaco was even helping PSG with a loan model so they could get their best player
I agree with
@Zehner here. If such transfers are regarded as business as usual, it just undermines the other clubs status as legitimate challengers and makes the league less attractive for neutral fans. And it has little to do with having to sell players. Even Bayern has to sell players if the players refuse to extent contracts (e.g. might be the case with Davies soon).
What I do not see though is the assumption that a change would directly correlate with more tv revenue. This has not been true for Italy and even in the Google search image he shared, you need a lot of good will to see a direct correlation with Klopp's Dortmund years. It's rather a constant rise in search results in general for both leagues with clearly higher interest from 2017/2018 than in the Klopp years for the Bundesliga. This theory is not really backed by the data we have and I think there are other factors that are far more important when it comes to tv revenue.