Mustrum_Ridcully
Legend
My way avoids a lot of the "action economy" problem WotC mentioned, and it does it by adhering to the concept of "One character per player". As far as I am concerned, if someone wants to play more than one character, he can DM. My game is about the PCs, not the NPCs.
But your solution looks very similar to "no summoning". Your way would work in 4E, too - just claim people have "pets" and cohorts and they always fight some extraneous monsters and minions that the PCs then don't have to deal with.
Maybe that's really the only working solution, in the end, anyway.