So unless phone makers want to be in the situation where end-users are less and less willing to pay for and upgrade to a new phone, they have to figure out something new.
Either turning the phone into a massive local personal AI device with lots of local compute. Or as suggested here opening the phone up and turning it into a general computing device.
Personally I would prefer the latter and I am kinda skeptical of the former eventhough it seems the path major manufacturers (Apple, Qualcomm) are taking.
There are some pursing a more general form of computing - in particular Samsung and Huawei:
https://www.samsung.com/us/apps/dex/
(Though still a very closed model of computing where the device provisioned with software through an app store rather being completely under the end-user's control. Perhaps business model plays a role here.)