I'm just not sure it is possible. The nascent digital economy is what energizes me, not automating networks. Could I force myself to redefine skills that took me 20 years to build? I have my doubts.
Same situation here - I work in a technology which is proprietary to my company and sometimes I also fear, what will happen, if I am let go. Of course I have varied background to work on another technology but that would not be my best. Only yesterday, I was thinking to start to redefine my skills and your post came up. I believe, we can definitely learn new skills. It may be faster or time taking, but its just our mind set - we need to make a plan and work on it. Slowly so that it won't leave any frustrations. We can mix that with confidence with the domain knowledge which is very much rewarding. I have decided to start with AWS Azure. Javascript is also on my list but I get bored quickly so have to add that as a advertisement may be in the main movie.
Whatever the new skill you've got to have a passion for it. It can't be a comfortable situation working with a proprietary system.