It was a brilliant performance by the Scots against an England team who are now top of the one-day global rankings.
Moeen picked out long-on and Adil Rashid was needlessly run out at the start of the 49th over, before Safyaan Sharif trapped Mark Wood lbw with a superb, inswinging yorker to end England's innings on 365.
Defeat raised fresh questions about England's ability to win one-off, winner-takes-all fixtures following last year's Champions Trophy semi-final loss to Pakistan.
"A one-off game like this, to bring your best game is very hard to do, they played well and deserved the result", said Morgan.
Bumble thinks Surrey's Tom Curran could force his way in to the starting XI come the start of the tournament with a good showing against Australia, while both he and Hussain agree that the ECB's qualifying rules should not be bent in order to allow Barbados-born Jofra Archer to become eligible to play for England in time for the World Cup.
Hussain interviewed Langer ahead of the series - watch the first ODI live on Sky Sports Cricket on Wednesday - who told him the team "would carry on sledging, but not resort to abuse".
"We didn't do enough to win, if we had won it would have been a bonus from where we were", added the former Ireland batsman.
Scotland's victory will send out a powerful message to the ICC, which voted to restrict the 2019 World Cup to 10 teams from the previous 14, which makes it far more hard for second-tier sides to qualify.