The teams will leave if there is more $ to be had in this Super League format vs. the Champions League.
The top players will continue to join these teams, if these teams have the most money to spend... even if it costs them National team spots.
(My guess is ultimately the Nations will make clear to FIFA etc they want their top players to be eligible, even if they are on club teams in the Super League.)
There all businesses. The players are all professionals. Of course it's about $.
And the existing Champions League and the EPL, La Liga, Ligue 1, Bundesliga, Serie A etc... they are just trying to protect what exists for their own ($) benefit.
Chris, you are generally correct in your assessment that its all about the money. However, I think you are mistaken a bit about players just kissing off playing for the national team. We don't have the long time culture around soccer that the rest of the world has. Playing for your country's national team is a BIG deal to many of them. And even getting some of that in this country.
Pulisic publicly announced he wanted to represent the US at the Olympics. I would suspect that he might well leave Chelsea if they were to be in the Super League and therefore prevented from playing in the WC. Now I never had the opportunity to play at that level. But I can tell you without a doubt that no amount of money would have kept me off the national team had I ever had that chance. No amount of money.