Bitcoin is the best project of the past, present and the future. There might appear many altcoins with much better characteristics than BTC, but people will still use it as a store of value.
people will use it as a tool to save their money. it may be less convenient than some altcoins, but it will always remain as decentralized and reliable as possible to save its funds
Bitcoin is the most popular use of all so its normal for them to use it. I don't look other altcoins since bitcoin is the most profitable of all, As it was easy to hold.