Libra has raised fears about the future of blockchain mainly because it goes against everything the community wants and believes in: decentralization.
Facebook could ultimately create a massive closed-loop revenue model from ads, digital marketplace, to payments. Do consumers want to bet on the status quo of existing monoliths?
https://elixxir.io/blog/is-libra-the-future-anyone-wants It's not what the community wants, but it's what Facebook wants to feed to us, and we all know that massive advertising and propaganda can make things a reality and make the community embrace it.
Facebook has a long run of success on what they are offering to us and they will concentrate all their resources here to make us embrace and support it, even though we don't want it.