Unless European countries in some grouping create a new curtain, the Muslim population will simply shift around, more like what happened with anti-Jew, anti-Gypsy, anti-Greek and anti-Ruthian etc kingdoms for several centuries before WWII.
So until a solid curtain of countries some how simultaneously close their borders, and the Eurozone passport treaties are nullified, and the trading partners of thee countries don’t boycott them, nothing will happen in Europe.
The best possibility would be for widespread reductions in social safety net expenditures to balance the budgets, forcing each European to personally look at the government budgets.
Quite frankly, the average European resident, be it native or immigrant, is more endangered by a collapsing social safety net in the short term and medium term time frames, than by the long term problem of replacement population immigration policy.
Portugal and southern Spain will be leading examples, both are completely bankrupt, there isn’t enough money to feed their own kids, let alone another immigrant mouth.
That is something to think about.
If the native European population does not act soon there will not be a majority European population young enough to expel the Muslim hordes.
On the other hand if the Europeans do expel the Muslim hordes; who will support the European elders on their pensions? The Europeans (like we in the US to a lesser extent) did not reproduce adequately to support our ‘Social Safety Net”.