The way of breaking that monopoly is to replace UEFI on machines with CoreBoot (http://www.coreboot.org/Welcome_to_coreboot). This still does not support enough hardware but given a bit of support from Linux friendly companies (e.g. Clevo, IBM etc) it could be done. To see CoreBoot in action have a look at the Samsung ChromeBook with CoreBoot (http://www.youtube.com/watch?v=RypqMqtTPs8).