There have been a lot of other alt currencies, but don't seem to have what Bitcoin does. I think down the road potentially, but as of now the focus seems to be on how to make Bitcoin better, safer and more accessible. We're pretty bullish on it.
They can't be bitcoin if bitcoin will be died and it will never replace by other cryptocurrencies because i think that bitcoin is the father of all alternative coins if theres no bitcoin it will be worthless for those altcoins. Bitcoin is good and very expensive to be change 
This discussion has nothing to do about being the father of all cryptocurrency, but the usage and effectiveness of Bitcoin with regards to economic and technical use.
That's right, although there are some factors in bitcoin has made it less in his efficiency and effectivity. like validating the transaction. different with the bank there is some high trust for validating the transaction in bitcoin all of the nodes are same. That's will take more to validation the transaction. and this makes less in his efficiency. but this was preventing about the intervention from the parties.
But its important to remember that bitcoin can add new features when they prove to be popular with other altcoins.
The only real possible scenario where an altcoin could overtake Bitcoin is if there is some serious flaw in the code that basically causes bitcoin to stop working.