So what do you think would happen if another Cryptocurrency (Example Monero / Ethereum etc) were to take Bitcoins spot as first in market cap?
Well if that will happen thier will be a new king on crypto but as we see so far that theres no other coin can surpass the value of bitcoin.
In order for some altcoin to become king, is not enough to take first place. He needs to prove himself, to defend this first place by trading volume and time spent during on the pedestal.