It is not only about the market cap, but about the brand bitcoin. If people talk in TV about crypto they will for sure mention bitcoin but only in some cases mention another currency. For a lot of people crypto = bitcoin and this will stay like this probably forever. The only time people speak about other coins is when there is a shitcoin having a huge pump, but that is mostly forgotten after a few weeks.
It may lose its value but that doesn't mean it was a sign of its end.