Or maybe they will launch Win 12 with optional TPM support.
Imho making the OS(es) TPM only cannot be good for their business, many people are still on Win 10 with no intention to switch, since their motheboard does not support TPM and do not want to upgrade PC / waste PCI-E slot on TPM extension.
It’s not directly the TPU - it’s the enhanced security instructions in the newer chips (which is the real reason for the very definite line drawn).
Read https://arstechnica.com/gadgets/2021/08/why-windows-11-has-such-strict-hardware-requirements-according-to-microsoft/ from “A towering stack of security acronyms”