Only if Microsoft acquires a major CPU chipmaker. There has to be a lot of vertical integration under one company, the way it is with Apple products. Otherwise there are other OS like Linux that comprise enough of the market to ensure there will always be an unlocked BIOS option.

You can do all that and more with an off-the-shelf mini PC running Linux. No need to reinvent a general purpose computer from a router. The chain of trust thing is above my paygrade, but I bet something like that exists.