Bitcoin has already dominated the crypto space, because it has always remained active and accessible without interruption, and to my own best of knowledge I don't think if companies like Facebook, Microsoft and Google have achieved this level of reliability which bitcoin has achieved so far, talk more of altcoins.
And I we also like to see more contributions from members of this forum, let prove to some folks out there that altcoins can never be a threat to bitcoin, because alot of folks out there are saying that ethereum will be the end and the down fall of bitcoin, which I doubt.
It has never been a threat to bitcoin at all because the strength of bitcoin is far better to be surpassed by any altcoin that exists today. Bitcoin is one of the best so far and generally the presence of bitcoin actually has an effect on the sustainability of crypto so that in any capacity altcioin does not have the ability to be a serious threat.
If it weren't for bitcoin maybe cryptocurrency would not be as big as it is now even though some people see the potential for profit in altcoins, but what makes this industry bigger is the presence of bitcoin as one of the best coins ever.