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but Bitcoin is the starting point for everyone, interested in cryptos.
Bitcoin is the word, advertised in mass media.
Ask people on the streets, what they know about Ethereum, Ripple and Bitcoin. I bet, almost all of them heard something about BTC and almost none of them heard about ETH and XRP, right?
Bitcoin has the Name

You’re right, but what else does it have? It has immutability and a decentralized architecture but so does almost every blockchain. Bitcoin is definitely the gateway drug for crypto and we have Satoshi to thank for that, but we also have AOL to thank for early email. That doesn’t mean we use AOL anymore.

Agreed. Bitcoin is some kind of a hook for the novice crypto enthusiasts.
As the fan of The Bat! by Ritlabs, no idea why we should thank or even mention the AOL :)
Let's see what Buterin thinks about Bitcoin:

Bitcoin has many goals. There is a basic team of developers. There are miners, where 53% of the capacities are somehow connected with Bitmain. Can they come to an agreement? No. I mean, it’s a dead end.

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Bitcoin has to give up it's throne one day, but it has to make cryptos famous before that as well

Definitely. I don’t want to diss Nakamoto. Bitcoin is the father of all cryptocurrencies, and no one can take that away from Bitcoin.