Let's put "huge" in perspective here. For shariah law to become actual law of the land, constitutions would have to be changed first. See, politicians can't just vote any law they want. Other branches of government need to ratify those laws first. Laws can't break the constitution. And to change the constitution (in Belgium, but I assume it won't be much different elsewhere), you require a 2/3 majority.
So how "huge" is this "huge" number of supporters, really?
I say that the chances of this happening are below zero. I invite you to demonstrate otherwise.