Eventually Nationalists/Conservatives will take power from Socialists/Liberals and hopefully the rule of law will be restored in Europe.
Political process will solve the problem of immigration , sharia enforcement and gun laws in Europe. I certainly hope that this is the path EU will take.
Radicalised muslims are very small minority among European populations ,so they are still a manageable problem.
People like Merkel and Hollande should be held accountable, at a minimum they should be made to resign, however I would prefer them to be tried.