In terms of trade, which is very important for crypto, BTC would be nothing without altcoins. Imagine how trading would be boring if we would trade nothing but BTC.
Also, altocoin ve brought a lot of innovations into crypto. All in all, BTC and alts is a win-win situation.
exactly. altcoins are an excellent source of making more bitcoin. i am sure a lot of users in altcoin boards couldn't have half the bitcoin they are holding right now if it weren't for altcoin trading

that used to be the case few years back when altcoins where not even released, Bitcoin can sustain itself by itself since it's a great financial system, just having some people interested in it is enough.
It is true. The Ethereum has a market cap of more than $1 billion. Without that, the $1 billion can raise the bitcoin price by $60.
yeah and Ethereum also has 80 million coins available already (which is 5 times more than current bitcoin supply BTW) and that ETH supply is growing by the day.
anybody can do the math for its real worth after a while (hint check other altcoins with similar
huge supply)