Holocaust? Certainly not, there were no Jewish states then, while now there are tens of Muslim states.
Repatriation, however, and similar stances are very likely. At the very least I imagine Islam will be banned somewhere and sometime in the future. Discrimination against Muslims, and Arabs and Asians generally, will then skyrocket and most Muslims will leave Europe.
I don't know though how likely, but will happen in one form or another, and to one degree or another I am sure.