Bitcoin is going 9yrs old, so far no alts surpasses Bitcoin. For 9yrs it remains the king. While Bitcoin is going down, no alts remains strong. All alts are crashing too. This is the best indication that Bitcoin has no replacement.
Yeah it is good thing to know that you had posted this comment so far I had this also in my mind and thinking also that how come bitcoin will be outdated when in marketcap volume was so huge and aside from that bitcoin is the dominant crypto in the market.