This milestone is a testament of Bitcoin ever growing micro economic importance which is deep rooted in institutional adoption what started as a fringe assert is now one of the biggest investment drives of the world today.
I'm not sure how true your declaration is statistically but I believe it to be quite right. A cryptocurrency having over 2 trillion dollars as a market cap is a feat that no other crypto currency has achieved, and one I don't think any cryptocurrency will achieve in the next decade aside from bitcoin.
Bitcoin has all the chances to become an alternative to fiat, a true alternative, I mean - not to destroy it, but to accompany it for those that understand BTC's strengths and values.
Satoshi had that in mind and you can tell from the bitcoin white paper that he did. The thing is because bitcoin is growing so much in price, it's being diversified more as a form of investment than a means of exchange.