Why do you compare Bitcoin to LTC, even in terms of halving? LTC is altcoin, fade copy of BTC and 2017/2018 is crushed altcoins so hard that they will not recover for a long time (maybe never). It actually turned out that there could only be one king on the throne, everyone else will fail over time.
It's a worthwhile comparison to make. You are focusing on "Bitcoin dominance" but you are ignoring that Litecoin massively outperformed both BTC and the entire altcoin market during it's pre-halving pump this year. That's a pretty strong indication that halving-driven demand is a real thing. That spells real implications for the BTC market as we approach the 2020 halving.