The price of bitcoin might increase only due to demand because without the Altcoins which promises huge returns and some people will to have invest almost all of that into bitcoin, which means a high demand of bitcoin than now.
Without altcoins many wouldn’t be in Disney world that they could be become rich over night from it and without them the scams done by fake or shit coins wouldn’t be there and the cryptocurrency space will actually gain the purity that bitcoin brings
If we are only talking about Bitcoin, it was not created to compete with anything; altcoins only appeared because Bitcoin is decentralized and no one can control it. So in order for them to gain control, they created altcoins, because through this, they will have the opportunity to take advantage of people they don't know so they can get money from other investors.
But let's accept it or not, Bitcoin quickly became popular because of altcoins. That's true; without altcoins appearing, I just think Bitcoin probably wouldn't reach the ATH of 69k$ each. It means that somehow altcoins have contributed a lot to the crypto space.