Hey There -
Sorry, but it won't. "All Users" is an internal Tableau group that doesn't map to the equivalent of an "Everyone" AD global group. That being said, you can easily use syncgroup against an AD group, and all of those users will get imported.
Most folks who I see importing users from AD don't try to import everyone at one time, though - they'll break it up into smaller chunks -- bringing smaller groups from AD in one at a time. This helps troubleshooting if something goes wrong.