It's strange how much time it takes for people to get familiar with changes and accept them. The first step was making them go from a completely centralized fiat system to semi-decentralized Bitcoin. Now they're slowly getting ready for a completely decentralized system with anonymous cryptocurrencies and DEX.
I'm only afraid that it will take another 20 years and we'll be old farts unable to fully enjoy it when it comes.
Why are you calling Bitcoin "semi-decentralized"? It's pretty much the most decentralized cryptocurrency out there thanks to its node count, hashpower and global community. The ecosystem of Bitcoin and cryptocurrency exchanges is centralized, but it's not caused by any of the Bitcoin's properties, so it's wrong to say that altcoins are the future. And privacy has little to do with decentralization, they are different topics, and usually decentralization is needed to achieve privacy - not the opposite.