the bitcoin that can possibly replace the BTC?

[pheonyx]

If there is altcoin that can replace the BTC what is it and when this could be possibly happen or what year?

[Marteel]

I think this is a big challenge for a short time, but imho, for a short time it is impossible. for the long term I believe in cypherium.

[Wipro]

If there is altcoin that can replace the BTC what is it and when this could be possibly happen or what year?

Body is fine bro, First make your Subject headline is correct. None of the altcoin will cross the bitcoin. Whatever may comes they will be consider as the altcoin list coin and that's value will be touched around the ethereum or lower value currencies.
First comparing bitcoin with the altcoins is not all the correct value to think that.
They will not be able to reach the bitcoins growth for around 25 years from now also. They will be a second rated coins only.