Honestly, as much as a clusterfudge as it would be, I can see the Suburban League adding a third tier. Wherever Medina goes, Brunswick will follow IMO. Can't see Solon getting turned down for the Suburban League. They make a lot of sense geographically, and if you put them in a division with, say, Twinsburg, Nordonia, Hudson, Aurora, etc., it cuts down majorly on travel. Even though it would push the conference past 16 and create problems, that may very well be their best bet unless something better comes along.
The reality of the situation is that the GCC is not going to last long as a league. Shaker and Elyria were the two dominoes to fall, and they'll keep falling from there.
The way I see things working out is:
Suburban Red (Bigger schools) Medina, Brunswick, Wadsworth, Stow, Brecksville, North Royalton
Suburban White (Mid-size schools) Solon, Hudson, Twinsburg, Kent Roosevelt, Aurora, Nordonia
Suburban Blue (Smaller schools) Medina Highland, Barberton, Tallmadge, Revere (if both stay), Copley, Cuyahoga Falls
And I know this idea sounds kinda far-fetched but hear me out. I imagine something like three tiers of six teams, with two conference crossovers to make it seven conference games (and saving the three non-conference games as well) in total.
And with a three team setup, for instance, each division plays the teams within it, plus a crossover with each school in the other one.
Ex. Solon plays Stow in Red, Revere in Blue, Cuyahoga Falls plays Wadsworth in Red, Kent Roosevelt in White, etc.
But should Tallmadge and Revere decide to leave, the Suburban COULD look like this:
American Division: Aurora, Barberton, Kent Roosevelt, Copley, Cuyahoga Falls, Nordonia, Twinsburg
National Division: Medina, Brunswick, Wadsworth, Stow, Brecksville, North Royalton, Solon, Hudson
Again, just speculating and grasping at straws here. I doubt this is how things will actually shake down.