I think dropping out for the time being is good for this major corporations in order to distance themselves on an innovation that has yet to segue into mainstream regulation yet. Congress is holding Libra back, partially in fear of the repercussions it could have by having a company as large and as far reaching as Facebook has become. I think fear, uncertainty, and doubt are whats holding Libra back. Perhaps the worlds leaders aren't ready for a globally used cryptocurrency, because that's  most likely what Libra will end up becoming, stable-coin or not.