It will never be fully open. They got all of the three letter agencies to cooperate with... that's why they want to stay on the CPU as primary OS next to Unix on the secondary processor Intel provides called Active Management Technology (AMT). This hardware and firmware for remote out-of-band management is running the Intel Management Engine, a separate microprocessor not exposed to the user, in order to monitor, maintain, update, upgrade, and repair them using mesh networks.
And with windows 11 requiring certain processors, I'm pretty sure Intel built something even more interesting into those ones which will make AMT look like childsplay.
They could just become a BSD, like Apple did. Nothing they're doing with linux wouldn't work with some future Microsoft BSD that kept backwards Windows compatibility as a Wine-type shell. They do that, they can close up whatever they want, just like Apple.
