My launcher started working again this morning. No change on my end, I suspect they fixed whatever encryption problem they were having with authentication to the minecraft servers.
Yep, my launcher log ( "%APPDATA%.minecraft\launcher_log.txt" on my machine ) is clean. I don't see those SSL/TLS errors anymore. In the future, if anyone needs to see a cleaner log for troubleshooting, you can always deleted that file and re-start the launcher and it will regenerate with new logs.
I'm definitely keeping MultiMC in my back pocket for any future issues!