The entire European football edifice requires correction and someone needs to be brave enough to make the first move.
FIFA's pleas to revise the Bosman ruling to save world football were not followed, but we still need to do that.
Germany has the least amount of foreigners and is the strongest economy in football. Spain and France could also follow and that's enough of a pull to get UEFA's attention with the EU behaving and stopping to talk about shitty notions of "inclusivity" when all they're doing is promoting a monopoly and ironically fining monopolies is their bread and butter...
The only country that has incentive to keep the current Bosman rule as it is, is the UK and they're not even in the EU anymore. Every mid-tier leafue has suffered, we no longer see them represented at quarter finals or even round of 16 of CL football and UEFA with the blessing of EU is promoting a Superleague structure.
Who else wants to keep this? Barcelona and Real Madrid since they're untouchable in Spain and anything else would bring the Valencias, Real Sociedads and Sevillas closer to them.
PSG doesn't want their league to be weak, Bayern also doesn't like this, but they follow the system because that's how you stay at the top today.
Worst case scenario to return to acceptable competitiveness: we flip the 4+4 + 17 foreigners out of 25 to a 17/25 domestic players and just 8 foreigners. Good luck to the top teams once that's done.
But someone needs to pull UEFA's arm and leg for this.