No. There is absolutely no chance that you will see Legacy support come back. In fact, moving forward, you will see more and more units without Legacy support.
Intel introduced EFI way back in the mid-90's. In 2005, Intel released EFI to the industry. The Unified EFI Forum was formed and released the first UEFI specification. In 2006, the forum released V2 of the specification. Now, 15 years later, almost every system utilizes a BIOS built on top of the UEFI Core. Every O/S, including every Linux Distro, supports UEFI. There is simply no need for Legacy (CSM-based) Boot support to be used or even available. I would argue that any product that does not support UEFI is a product that is not being properly maintained (or flat out isn't being maintained) and should be avoided.
Down off my soapbox now...