Bitcoin's current position is really not easy to beat, I agree on it. Its adoption is getting better and better every year and it looks like we will see it continuing in the future also. But on the other hand, Bitcoin is not actually unbeatable of course. There is just not a cryptocurrency as strong as it is now and therefore Bitcoin maintains its lead and dominates the market easily.
Bitcoin's position in the market is indeed not easy to beat by other cryptocurrency, for some specific reason that we don't know. Blockchain of bitcoin has so much proven in the crypto market where the new risen altcoin or those altcoins that was left behind in bitcoin would need to beat off.
It is not impossible, at the same time, the possibility of it happening is very minute. The fact that btc is first crypto launched, it will for a long time be the most valuable crypto reason being that it has more widespread popularity among crypto enthusiasts, and being the pioneer coin, it is more likely to be considered for adoption by any government or enterprise.
And at the same time we can't be so sure that the current market position of bitcoin will still remain because its true that any possibility are possible to happen. But i do still wanting to see bitcoin on top of the market above all.