Lately I have realized couple of newbies complain about vulnerability of the market because of the dips
But truth is we seem to have forgotten that
Whereas Bitcoin is the first and largest decentralised digital currency used as a store of value and a means of payment, Ethereum is the largest decentralised application network.
That explains why bitcoin dominance seem unbreachable
Yes, at this point I think you are right and the place of BTC at the top of the crypto market is unshakable. But I think it will come the moment (at least after 4-5 years) that Ethereum (or maybe some other altcoin) will be able to replace it. There are many projects that try to eliminate the disadvantages of the big coins, and that can be a huge advance.