Auto-naming playlists when duplicating

This is untested, but it should do the job of switching back to the old playlist.

//NOTE: For this script to work, disable the preference to suppress new playlist dialog under
//Pro Tools > Preferences > Editing > Supress Name Dialog When Creating New Playlist

function incrementPlaylistNumber(str) {
    var numberRegex = /\d+$/;
    var match = str.match(numberRegex);
    if (match) {
        var number = parseInt(match[0]) + 1;
        return str.replace(numberRegex, number);
    } else {
        return str + " 2";
    }
}

function selectPlaylistByName({ name }) {
    sf.ui.proTools.selectedTrack.popupButtons.whoseTitle.is('Playlist selector').first.popupMenuSelect({
        menuSelector: items => items.filter(i => i.path[0].replace(/ \(\d+\)$/, '') === name)[0]
    });
}

function duplicatePlaylistIncrement() {
    //Activate Pro Tools main window
    sf.ui.proTools.appActivateMainWindow();

    //Get the current track/playlist name
    var oldPlaylistName = sf.ui.proTools.selectedTrackNames[0];

    //Create new playlist name
    var newPlaylistName = incrementPlaylistNumber(oldPlaylistName);

    //Duplicate selected track playlist
    sf.ui.proTools.selectedTrack.popupButtons.whoseTitle.is('Playlist selector').first.popupMenuSelect({
        menuPath: ["Duplicate..."],
    });

    const dlg = sf.ui.proTools.confirmationDialog;

    //Wait for Duplicate Playlist window to appear
    dlg.elementWaitFor({ waitType: "Appear", });

    //Add new playlist name
    dlg.textFields.first.elementSetTextFieldWithAreaValue({
        value: newPlaylistName
    });

    //Click OK in Duplicate Playlist window
    dlg.buttons.whoseTitle.is('OK').first.elementClick();

    //Wait for Duplicate Playlist window to disappear
    dlg.elementWaitFor({ waitType: "Disappear", });

    //Select Original playlist
    selectPlaylistByName({ name: oldPlaylistName });
}

duplicatePlaylistIncrement();

This may however not work as a reusable workflow though, as it will only increment the playlist name the first time you run it, the second time it will then try to duplicate the playlist with the same name as the previous backup. It will then throw a dialog saying that there is already a playlist with this name.