I never believe the altcoins can replace Bitcoin, it was the first coin and the mother coin in the world, and many places accept the BTC for payment, if it was replaced by others, I think the market will be corrupted, no one will trust the cryptocurrencies again.
The advatage being the first crypto coin that's been embrace inside this market,
It's far from possibilities that any coin would replace this asset, indeed if ever that there's another project that may overtrone this coin
the chance that each time the threat of being manipulated and corrupted would happen from time to time.
Still positive that it will stay at the top far from any coin around this market.