Actually worried about how this could affect players. RM and Barca, not so much. The debt and politics they face on a daily basis means this would seem like peanuts.
However, for English clubs, this is radical. Not sure how much impact it'll have on players. Even the notional thought of banning players from WC/Euros could possibly affect them.
Additionally, I'm still unsure if this will go ahead completely. OR if it will lead to a compromise in the current UEFA Champions League or w/e with concessions being made to these clubs.
Either ways, honestly, the day-in and day-out playing of super clubs against each other - the novelty would probably wear out much quicker than anything else.