In my opinion, I think another crypto will lead the market in the future. Not all the time, bitcoin will be in the first place. Lots of crypto are coming out lately with a higher value so for sure, one of them will defeat bitcoin. But, only time knows when will it happen.
Only time is going to tell whether Bitcoin is going to lead the cryptocurrency market forever but in my opinion it is going to stay at the forefront for a very long time especially since the new cryptos are not really bringing anything new to the board at all.