Check again. The financial crisis started the rise of the right-wing parties. The refugee crisis then exacerbated it. For instance, the German AfD was original

Check again. The financial crisis started the rise of the right-wing parties. The refugee crisis then exacerbated it. For instance, the German AfD was originally a euro-skeptic party lead by some economics professors. It later ousted those leaders and rebranded into a more plainly nationalist party when that became en vogue. I don't know exactly about other European countries since I'm German, but from what I've seen, the downfall of the classical parties started way before 2015 in many of them as a result of frustration over the handling of the 2008 financial crisis.