I do not think any other coin can afford to take the crown from bitcoin for now, because its market capitalization may be declining for now, but I doubt it will lose its first place in the near future, but it is so difficult but it is possible that the throne will get it, because potential buyers are Ethereum and XRP, It is also possible to have a new altcoin with the potential to get the number slot, But it is also very difficult to replace the parent of all digital currencies.