I thought the real value of Bitcoin is hiding shady deals: drugs, money laundering, etc. Needless to say, there is plenty of that to drive Bitcoin value up.
Even if no one "believes" in it, and the value essentially freefalls, BTC or something like it is still useful as a short term settlement device in lieu of taking suitcases of cash over a border or similar. You buy the token, send it to someone, they cash it out. People on each side (maybe the same person!) take a cut.