You're the one making the prediction, so you tell us.
I'm asking a question. The idea used to be that refugee status was temporary and that most would be repatriated, if possible, once the conflict was over. At present, in our degraded discourse, there seems to be no real distinction between refugees, asylum seekers, economic migrants and immigrants.
Outdated and dysfunctional laws do not help. It is only prudent, before a country accepts refugees, to have an idea about whether the arrangement is supposed to be temporary or permanent. Effective policies depend on knowing that. The fact that no European leader seems to be thinking of it makes me mistrust all of them and propose not accepting random people.
the number who return to Syria will be higher than the number who were invited to Germany by Merkel.
Fine. "allowed" in. How many of the random assemblage of refugees and economic migrants that Merkel allowed into Germany ever leave? How many will ever not be dependent on governmnet largesse?