I had previously doubted that Bitcoin would be replaced by another currency. But my mind has changed. Because I see there are many other cryptocurrencies that the developers are trying hard to solve the problems in cryptocurrencies. What about bitcoin? We don't know who are the developers and no effort is being made to develop it.
If you don't try hard, your rivals will win. Bitcoin's rivals will win too.
I do not think so. Bitcoin is still run by some people but we do not know them. Although bitcoin trading is costly and time consuming, it has many benefits. Bitcoin is very expensive and is very well suited for large transactions, the fee will be cheaper if fewer bitcoins are traded.
For other altcoins, the amount of each altcoin is too low so the transaction will become much slower and the charge will be higher. So I think Bitcoin will still be in the top 1.