It's never too late to invest. You can still be considered an early adopter, as very few people still use it.
There's always a chance for any altcoin to leapfrog Bitcoin. That will not happen in the near future though, considering how much Bitcoin is dominating the competition.
in the comming future this will not happen that BTC will be end...many cryptoghrapies are comming like BTC but they will take some time to participate in the world with BTC.
For me I believe that bitcoin will end if its destined to be end because in this world nothing is permanent.if it will end. We should have to accept it.