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Super versatile and not too specialized. It will always be in demand, even after the fall of society. Don't just stick to theory, learn practical applications and uses as well.
I can only name you a handful of men off the top of my head that I would identify as tech leaders. e.g. Elon Musk, Steves Jobs (obviously deceased) and Wozniack, Linus Torvalds, Gates used to be there. But other than that...
Why do they assume they have a right to supply the US Government with anything? THe Us Government as a "company" can choose products for company-wide use or non use. Some companies required Blackberries at one time. Now they're no longer allowed. Apparently the critics are right, they don't like free enterprise!
Bitcoin is NOT legal tender in the USA. While it can be traded, but it's tantamount to paying your taxes in chickens and/ or lawn care. BC is way too volatile and possibly headed to valueless.