Well, that's not set in stone yet. If he doesn't manage to form a coalition (and it's very much in the realm of possibilities that he won't be able to), the GreenLeft-Labour Party is next in line. In which case a GL-PvdA/VVD/NSC/D66 coalition (parties #2-#5) is not unlikely. Which I'm guessing would have to make some concessions when it comes to migration, but would probably be OK-ish news for the EU, the climate, and democracy and rule of law.
Sure, but it's the amount of support he got that scares me. There's a lot of support for the right wing in the Netherlands. That means that either a lot of people support those views or are willing to put up with these xenophobic zealots just to make a statement.