Do you think Bitcoin will remain the most dominant coin both short and long term? Even though it does not remain the most dominant coin, this will not be the same as saying that Bitcoin wont exist long term.
I think that will be very difficult to happen and probably will hardly ever happen because the self-built community is very solid and massive, and to take it over is very difficult as long as digital transactions still occur and users and merchants still using Bitcoin to transact or exchange it to another coin.