If we are Infinity

[Minyatur]

It'll become 4D when all 3D entity will die.

This statement would be entirely accurate were it not for dual-activated beings who, besides possessing a 3rd density interfaceable mind, physical vehicle and consciousness, possess also a secondary dormant version of each in potentiation which is capable of complete ease of transition and sublime emergence into 4th density awareness without death being a primary prerequisite to awareness of the metaphysical shift in dimensional energy. Those consciousnesses which have engaged in work involving energetic expansion and vibrational amplification, have unhinged those barriers which inhibit psychospiritual awareness and receptivity, or who are simply of existential antiquity will be the initial detectors of the alteration of densities. Thus, complete physical obliteration of the populace is not necessary for the modification of being on the collective level. In a sense, then, 3rd density entities who are not dual activated or do not have any of the aforementioned criteria applicable to them would indeed have to await the expiration of the incarnation in order to enter into the current dawning of the 4th density in its foetal stages.

I'm not entirely sure what you meant by the sentence I put in bold. In my perspective 3rd density entities who are not ready for 4D will incarnate in other 3rd density worlds which will provide the lessons they need to learn before entering any 4th density planet.