No upsets is much more likely than any other prediction. Just because you know there will be upsets doesn't mean you know which specific upsets will occur. In fact, it's probably more likely that no upsets occur than one specific set of upsets occur. It's only because there so many ways for upsets to occur (think about combinatorics/entropy), that you're virtually guaranteed to get an upset.

If you're driving down the street, do you think you're more likely to see an ordered license plate (123456) or an unordered license plate (163542)? Obviously unordered plates are more common. But if I ask: are you more likely to see the specific plate 123456 or the specific plate 163542, they are equally likely (even though the second plate has more 'apparent' randomness).

But that's how predictions go, same as the betting odds.

It doesn't mean a lesser team can't win or a bigger team not loosing all their group games (as France did one time)

It's possible you're thinking of a previous event I've forgotten, but presuming you're referring to South Africa four years ago, France actually lost 2 and drew 1 - sorry for pedantry :)

that's alright, was actually thinking of 2002 when they did the same (lost 2 and drew 1). Anyway, they did badly