Current State of End-Game Contents - A Blog Post from A Japanese Player

[Kuwagami]

It really feels to me there is going to be a "stretching" effect. CT2 will come out and that will be fine, and then 3rd coil will arrive. By late into updates centric to the 3rd coil age, we'll realize that maybe 10% of the game is in 3rd coil, the majority are going to be in early 2nd coil and a shocking amount /STILL/ stuck at T5. From there the effect will get slowly worse each time. Mostly due to wipe/instant death mechanics.

You're overestimating the amount of people already in SCoB. More likely around 5-6%