The possibility is there as even right now there are cryptocurrencies that are better than Bitcoin already, Monero is more anonymous than BTC, XRP has faster transaction speeds compared to BTC, however they are defeated to BTC as it is the most popular cryptocurrency out there. What I am seeing is that Bitcoin will be surely replace by another cryptocurrency but it will take a long time to do so as a lot of people are still going to buy what is the most popular and that is Bitcoin. Bitcoin's days are numbered we just need more people to get familiar in the cryptocurrency market.
You are correct, there are really a lot of coins out there that are really way above and better than bitcoin, but it doesn't mean that they can easily take over the lead and replace bitcoin simply because more people still 'trust' it.
But if investors see's otherwise, or new coins born and suddenly we see shifts in terms of money, then bitcoin will be overtaken, the questions is that are there coins that can make investors move out of bitcoin? I doubt it.