We've been watching an ongoing Premier-League-ification of cycling for a while, and plenty of proposals in order to lock it off. And not just from the UCI/big money team side either - Vaughters' franchise idea was largely to prevent his team being one of those that fell by the wayside (and his concern has been shown to be correct, with EF being one of the bottom teams).
Making the top races even more inflexible in terms of invites is just going to make it not worth anybody's time trying to run a ProTeam level team unless they're in one of a small handful of countries, however. A lot of those smaller races that have benefited big time over the last season from these teams desperate for points coming in are probably going to completely fall back the other way once the top level is kinda locked off, though, as they will no longer see any big teams come in and ProTeam level teams will be far lower draws (they already are relative to 10-15 years ago) than they are now. And a lot of races that need to drive up local sponsors may not appreciate the restriction of wildcard opportunities making it harder to give the race a local flavour or increase local interest, as well as concentrate all non-WT riders from that country into a smaller number of ProTeams, further enhancing the Premier-League-ification by impoverishing all but the top handful of PT squads.
And of course, you've always got the problem of what happens if Lotto or Movistar lawyer up? If Mas gets turfed out of the Vuelta for Covid protocols, or some late season races on a team's calendar get cancelled due to a case surge, or Lotto fall only a couple of points short with a number of race cancellations in the Low Countries that would have favoured them or are forced to withdraw a big rider the day of, say, Paris-Tours due to Covid protocols, surely they protest that they were penalised for complying with the rules? And with results across 2020 and 2021 being part of the issue when every country had different regulations in place, teams can rightly challenge that they may have been disadvantaged simply by falling under different legal jurisdiction to a team that was afforded more freedom to train, or was able to travel to more races, or where more races were allowed to be organised sooner after the Covid-restricted periods?
I just foresee a big mess come season's end.