bitcoin will always be the dominant choice of many investors, both long-term and short-term, because the advantage in bitcoin is very tempting that many people will be the people to stay in bitcoin.
It will remain dominant for some years atleast considering the next altcoin which is ETH is way back when you compare the price and the market cap. Considering this if ETH has to reach anywhere near also will have to rise a lot in next few years which can help to overtake the BTC.