While I do not expect to see Android devices with future Snapdragon 8 Gen 4 chipsets immediately booting mainline kernels on release, this might be a step towards achieving something closer to that. Those efforts will certainly make it easier for phone manufacturers to release updated kernels, and therefore Android releases, for their devices, or at least stop using Qualcomm as the excuse for not doing so (see e.g. Fairphone 4's software support roadmap: https://support.fairphone.com/hc/en-us/articles/9979180437393-Fairphone-OS).