"We must destroy democracy to save democracy."
EDIT:
The OP strikes me as the kind of guy that would side with a group of religious extremists trying to unilaterally execute the democratically elected head of government because "He's too dangerous to be left alive." during the middle of a civil war.
Oh, wait, now you're the fascist.
The problems that his voters have will somehow need to be addressed. However, I expect that once Wilders is in power, he also can't solve the problems (for example: building lots of housing is not something a politician can do, especially when you shun immigrants who can solve the labor part of that) and the disillusioned voters will have to find someone else, if they are smart enough to recognize this instead of hailing Wilders as a saint who can do no wrong (and instead blame everything on who is not in power)
As an off topic comment I know people who write stuff that has this sort of confusion and invariably the one's writing satire congratulate themselves on a job well done. I disagree with that assessment.
The solution is pretty simple: officially ban the far-right parties and politicians, if the voters fail to get the message to not vote for them. If a national government is captured, and the minority parties cannot fix the problem, then the EU needs to step in and return things to normalcy. Democracy dies if the voters can actually give power to fringe forces outside the mainstream.