personally I do not think that Bitcoin is already over or ever will be.
more likely it would simply become less prominent and perhaps more rare.
however it is very unlikely to disappear entirely. may be it will be like some sort of a rarity, available only for institutional investors.
as for the rest of the Cryptos ... it looks like it is shifting towards the corporational tokens, stablecoins and "crypto-fiat", IMO
RE: The end of bitcoin will be the start of crypto.