The reason ARM OEMs aren't able to include a disable feature is because Microsoft said so, and that's all I know about it. Also, their market dominance is not something I would write off as being "very little leverage". If you want your OEM hardware to wear the "Certified for Windows 8" sticker on the front, you do what Microsoft says.
... since SB doesn't seem to be a MS-only product, it's kinda difficult to sue them when they're not the only one you should be pointing fingers at.
Accusing us of being short-sighted is just as short-sighted as the companies who agreed to support such a technology
Uh... where are you getting the impression we don't care?
What I've been saying is AGAINST SecureBoot
but as I've said a dozen times before, there needs to be a compromise. It doesn't HAVE to be a BIOS option, it could be a motherboard jumper setting. After all, allowing a software method to disable a "security" feature is in itself a security flaw.