Replacing Bitcoin is not going to happen that easily, thats for sure.  I just cant imagine some other coin knockin it off its throne.  Bitcoin is the OG, the one that made digital money possible and it has seen some wild highs and lows over the years but it is still standing strong.   

Now dont get me wrong, I know what some of these new kids on the block are doing with all their bells and whistles.  Could be they end up matterin someday, who knows.  But for me personally, nothing beats Bitcoin's raw simplicity and battle-tested cred in my book.  Maybe Im old school but to me the original is still the best.