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You might well be right - I'm not a Bitcoin investor or advocate. OTOH, while using gold for physical exchange in small amounts is workable, that breaks down when you get to large amounts. A million dollars of gold is about 20 kg. One hundred million dollars requires an armoured truck to transport. That's not a good way to do business. And indeed, we rarely see gold used for exchange. We rarely see bitcoin used either, but it happens - for example, criminals use it for ransom payment.

I'm not sure that FB or Google happened as quickly as you think, but in any case, there are less obvious issues with coordination. One person can start using Google. For BTC to be useful, many people have to start using it, and it might not be surprising that that takes a while, or starts among investors rather than ordinary Joes. It might not even be surprising that it starts with a huge amount of speculation - that doesn't prove the price won't settle down eventually.