The proposed remedy in the complaint is the divestiture of Instagram and / or WhatsApp (extremely unlikely) and increased oversight on Facebook in the future that would make similar acquisitions much more difficult (more likely).
As Scott Galloway has been saying for years, it would be great for stockholders. Facebook is an old-n-busted service for old-n-busted people. (You might think I'm one of those, using such an old-n-busted idiom, but even I'm young enough not to be on Facebook.) IG and Whatsapp both would thrive if they weren't chained to all that dead weight.
Divestiture wouldn't be so good for Facebook execs, but does anyone care about them?