I wouldn't underestimate the Oranje reserves, though, when you have Huntelaar, Afeellay, Bouma, etc as backup, you can still beat Romania.
Holland playing some amazing football, a joy to watch, which is great considering the rest of the tournie hasn't been spectacular.
EDIT: Fili, Portugal is another great team, but Holland would go through if they meet, IMO. I think Scolari would be able to prevent a 3 goal margin, but they're just too strong and have too muchy momentum. People doubted Holland because they had a great attack, but their defence seemed lacking, but the defence has proven to be tremendous. Simiarly, people had some soubts about Portugal because despite a great defence and midfield, they lack a striker of the same calibre, and that seems to be the case, as, IMO, Gomes has not added much, as a striker, to the team, as can be seen by him getting subbed in both matches, despite being captain. Also, I don't think Portugal will be able to handle Holland's pace. Even Maks, who has the stamina of a horse, looked tired at the last ten minutes today, and neither Petit nor Moutinho look like they can handle all that the Oranje midfield packs, especially when at any moment, they can bring in a sub of the same level, whose fresh off the bench, and win the match in a single counter. That said, I'd love to see a Portugal - Holland match because they're looking like the best teams in the tournie, it's very possible that we'll see them in the Final.