For all the people saying thats not how layering works. This is a direct quote from Blizzard less than a month ago. They directly say that removing layering come phase 2 will impact queues even more.
Something to note as well. This post was made prior to them caving and increasing realm capacity to add more layers. So as we inch closer to Phase 2, will be interesting. Think we need more of an explanation on how it works.