BTC dominance is far too high and I hardly doubt that an altcoin will replace BTC one day. I prefer to use altcoins, but the majority of investors still believes in Bitcoin and sells all their altcoins to get some extra BTC.
It is not going to happen. I can't see any altcoin outpricing Bitcoin in terms of value right now unless it has to be a new and more secure cryptographic currency that has none of the disadvantages bitcoin currently faces
How about eth and xrp? Somehow thesee two are primary contender for the btc. Well the marketcap seems to be not marching towards btc but when it comes to different aspect I think technically these two are way better than btc. I'm not saying they can overwhelm btc price that much but the tech itself are proven useful. Especially eth network.