Yes, disenchanted youth turn to religion. In the UK many are turning to Islam. However, in reality their numbers are irrelevant.

In the last fourty years, I have seen the numbers of Muslims increase in both the UK and Denmark. Those muslims born and bred in those countries are integrating better than their parents and holding positions, their parents never even concieved possible.

A caliphate system in a major Europe country will never happen.

In fact, it probably won;'t even happen in an Islamic country.