I like the idea of having a secure boot. However, having a secure boot where the trust anchor is an entity that has radically different, if not conflicting goals and requirements to those of Linux users is a risky proposition. I fear there are only 2 stable, extreme outcomes to this:
a) Linux becomes a heavily locked down software eco-system.
b) Linux becomes non-bootable on common hardware.
The middle-ground some seek, I'm not sure is achievable by accepting a scheme that has such an other entity as trust anchor.