What do you think?
No one knows on what bitcoin isn't still being replaced yet in spite on being outclassed by most updated or good featured altcoins in the market currently.
But we can already presume that Bitcoin is king of crypto that's why its being mainly supported by the masses in spite of its scability issues.
We can't prediction about which one altcoin replace for bitcoin at the future, maybe have one altcoin next year get many investor have higher price could be replace of bitcoin, today still not have altcoin can replace bitcoin position, Bitcoin only one coin have higher price so far, many altcoin have lower price its why they can't replace of bitcoin.