As I've shared plenty here on Openhandweb, when the Merkabah is fully active, then at a soul level, you decide when it's time to leave here, through the practice of Maya (or Maha) Samadhi.

Here's a Tibetan monk who has clearly undertaken just that. As the Shift ultimately concludes, I do believe it will be how plenty will pass on into the higher state of consciousness. You simply leave the physical body and step into a body of light - the higher aspect of the Merkabah.