The potential partners you've listed only withdrew their support for the project once they realized how difficult it would be for Facebook's Libra cryptocurrency project to launch in the US amongst other places due to regulatory hurdles, but once these are overcome it should be a success and bring further adoption of these technologies to the entire market
Facebook is still complicated with Libra and always seems to be unable to convince the congress.
but the libra association still claims many investors are still paying attention and can join at the right time. For supporting partners who have already resigned, they also don't want their steps to ultimately affect the company's reputation which affects shareholders, just a kind of protective measure.