Hmmpf… i got a feeling regardless of what i show you specifically, even if you ask, you’ve already made up your mind. 
I’ll show you anyway regardless, for the sake of the overall discussion on the layering topic.
Let me say this first though.
Let’s not pretend there’s a perfect solution that will magically secure server health longterm and make everybody happy, because as long as there’s ever a time where people get to decide how they populate any given server, imbalance is inevitable and dead realms can emerge given the nature of players. And those, if Blizzard doesn’t wanna see them, will need manual attention again.
The fact is, if layering goes through, it will manage server pops (at the cost of everything else) during the first inital period of the game exclusively, while the actual rest of the game is left to the Classic’s playerbase own devices and decisions. That time being a significantly much longer of a time than the inital period layering is active, aka years probably instead of weeks/months, opening up much more potential of server health issues down the road that will need to be dealt with, without layering, again.
That said, If you really wanna listen to what i suggested in terms of dealing with launch, read the post i made here, linked below.
Scroll a bit down, to the second last (and last) part where i go into an approach style they could use to help with the big initial wave and server health during the first time period of the game, and why i think it’s overall preferable to the current layering approach.
I’m certain Blizzard has additional ways to support this style technically, but this is the idea of the direction they could go in as an alternative, in line with the prio being the authenticity of the game. 