If we can learn anything from history, I wouldn't hold my breath waiting for the standardization. Just look at situation on the operating system side. Different flavors of Unix, VMS, z/OS, Windows. Sure there are concepts that apply to all of them, but if you want to be an expert you really need to go deep on the vendor specific things.
Anecdotal: my cousin is a sysadmin and he recently took a certification class for z/OS. He says it was probably the best career-enhancing step he's ever made.
