^ The Argentina optimism comes from their potential run. They should easily win their group and then in the second round they will get either France, Ecuador or Switzerland. All of these can give them a good match but they should have the firepower.
So basically it is pretty straightforward to the last 8 where they will likely meet Portugal. This would be a close encounter but looking at both sqauds I think the Argies will edge it.
Then come Spain and I think the hope for those supporting Argentina is that fatigue catches up with them like it did in the Confed cup final.
Looking at their run to the last 4 it looks very doable for them to at least make it to that stage as they can do so without facing Spain, Netherlands, Brazil, Germany, Italy.