It appears that legacy BIOS support will be coming to an end in a few years as Intel has started guiding its motherboard partners to end its support in UEFI firmware by 2020. More specifically, the chip-maker's products will cease having the compatibility support module (CSM) in that year, and it is what allows BIOS-based devices and operating systems to work with UEFI-based hardware. Among the system classes of UEFI, this is UEFI Class 3, and newer versions of Windows Secure Boot will require UEFI Class 3 devices to function.
With the loss of CSM will come the loss of 32-bit operating systems, at least on newer machines, as these OSes require it to function. We will not lose 32-bit applications of course, as they are handled through a translation layer already, and this is essentially what will be required of old hardware. Instead of devices being able to work directly with UEFI through CSM, OS-based programs will be required to properly configure them. As TechPowerUp points out, this could manifest itself as one's main display not booting up with your computer, if the GPU is from 2013 or older, when video cards lacked UEFI-ready BIOS.
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