I feel like the majority of people care that much about decentralization. But I also think they don't care that much about centralization.
Often whatever comes first and works is what gets ingrained.
Contrast: if some big corp came along and tried to centralize email, people would (hopefully?) tell them to eff off. But, trying to decentralize microblogging is a big effort because Twitter was there first.
Let's get there first with things then, I guess.