We will see how facebook can smoothly process this legal concern easily and check how SEC will take the matters lightly. Facebook is famous and we know that, maybe SEC will favor them considering its also a US based company.
I am not so sure about that. If the SEC allows FB to launch their coin without any problems this may be used as a door opener for other companies to launch their own coins, too. This may result in a lot of custom blockchains and coins which arent compatible, fragmenting the crypto space way more than it already is.