I think it's necessary to point out that the founding clubs must have their places guaranteed to establish the Super League. Sure they will be rewarded financially but it is also a necessity that they consistently participate to guarantee the funding and the tv rights.
After 15-20 years once the league is established, expanded and replaced the CL then we will see how the domestic league performances gain entrance into the SL and the system evolves. The lesser leagues in Europe will probably have their regional Super League's by then (with the big 4/5 staying purely domestic) and we will wonder how we ever stayed with the old archaic Uefa model for so long.
After 15-20 years once the league is established, expanded and replaced the CL then we will see how the domestic league performances gain entrance into the SL and the system evolves. The lesser leagues in Europe will probably have their regional Super League's by then (with the big 4/5 staying purely domestic) and we will wonder how we ever stayed with the old archaic Uefa model for so long.