It rarely ever feels a sensible lineup...I feel like its time to drop that model out of the lineup and just go with the 12" MacBook (wishful thinking), 13/15 MBA, 14/16 MBP. That sounds like a sensible lineup.
Just as they near it... they will release something akin to the butterfly keyboard!
Next year I predict VisionPro to be required in Apple Stores to browse their product lineup... because they won't physically fit them all in the stores :/