Don't give people an idea to create a new coin: KingCoin or KingKongCoin
There is not one currency. In the past (80's/90's) $ was King of the World, after Euro got introduced it become better and GBP is still worth more, ok, crypto currencies are different, but one currency is never good for the world so a top 10/20 will always be there with a maybe 3-5 kings (and a few queens  )