Ong, you seem fixated on the value of a single coin, but this doesn't really matter. Just move the decimal point.

Ofc it feels crazy to us that an average entry level sedan costs 3-5mm units of currency, but that's the case in Japan with the Yen trading at ~105:1 USD. The thing is, it's normal to the Japanese.

With BTC, we're dealing with the opposite-- the same car is worth somewhere around .625 BTC. But already it's common to count BTC in Satoshi's or Sats, the smallest divisible unit of BTC, which is a millionth of a BTC. There are ways to further break up sats, but for context, BTC would need to reach 1mm for a sat to reach parity with 1c USD

Nonetheless, it does seem like BTC will continue to be digital gold. With that said, it's estimated that all the gold that's ever been mined in human history is currently worth in the realm of 2 trillion USD, but there's nearly 40 trillion USD worth of currency in the world. I'm not sure if it makes sense to expect a similar ratio of primary store of value to active currency in the cryptoverse, but it seems like a reasonable starting prediction.