Actually it appears they did – they gained 10 seats or to put it another way a gain of 250%. Wilders’ party only gained 5 seats, which was not only far less than expected, they also got a lower share of the vote and less seats than in 2010, hence “next time” is probably wishful thinking, his peak appears to have come and gone.
I’d rate your assessment far more accurate than ninfan’s on that basis. There might be a slight shift to the right in general, but it’s far from a shift to nationalism.
edit: and looking at the likely coalition, whilst it might have a centre right PM, the majority of seats in it will belong to slightly left of centre parties. PVV might have won more seats, but its won some of them from the ruling VVD and given it will be shut out of the coalition, in doing so it’s probably shifted the ruling coalition to the left 😆