What is the secret behind dominance of bitcoin on the crypto markets?

[MaMooN]

I have a question that I do not have a clear answer so far.

Why does everyone think that the future and the top will remain for the bitcoin only and there is no possibility for other

cryptocurrencies to be in the top and become the most valuable and traded?

Is that cause of bitcoin being first one in the market?

  In other words, if it were not the existence of bitcoin technology, will not find the other cryptocurrencies?

Are the rest of the other technologies an extension & expansion of the bitcoin?
 
Is there any possibility for alternative cryptocurrency to be first with better features?