I think the effects of the Saudi teams are not that bad as being portrayed by the media; this is something that happens in every transfer window. At some point it was PSG buying every best gems in Europe to France, at some point it was Real Madrid splashing the cash to get Galaticos, Even Manchester City had their fair share; splashing lots of money on players in the market transfer, and Barcelona is not left out too. Now it is time to the Saudi league to flex the wealth of their football team, get the necessary viewers and fame too.
I don't think its the same thing.
I don't think any of all these clubs you mentioned have signed more than five star players in a single season. They sign like three to four star players and a few other above average players or young players with potential.
Secondly, these clubs don't splash ridiculous amount of money as transfer fees and even more ridiculous amounts as salaries.
Its normal for the Saudis to spend that much money if they really want to invest in their league because they have the money. It would be nice to see more mainstream leagues. It doesn't have to be just Europe. I don't see this as a competition for European football. For someone who likes d=football, I see it as a way to have more leagues I can watch and enjoy.
The problem is I don't think the Saudi league would ever be a rival to the European league. It would be just another league.