It's either being part of the EU and accepting the influx of other cultures, or leave.
Poland is still a sovereign nation. To borrow an equivalent American term, Poland has "states' rights."
It was Merkel's madness which woke Poles up to unelected and unaccountable Berlin-based EU tyranny trying to ram quotas of non-EU economic migrants down everyone's throat.
Even though Poles have taken advantage of the free movement of labor to go to places like Germany and the UK, Poland's economy has still been doing quite well over the past decade. Unemployment has been declining (most notably since PiS was elected) and was never nearly as high as some other EU countries have been especially Greece and Spain.
Greeks and Spaniards and others struggling elsewhere in the EU never left in waves to find a better life in Poland. But Poland has balanced things well though by bringing Ukrainians and Belarusians in to help fill vacancies.
I've said before that advanced economies are changing through ever increasing use of artificial intelligence and robotics.
The leftist dream of an international socialist revolution marching its way from the Third World to the West is dead. The need for labor is dwindling at an ever accelerating rate.
Finding consumers with sources of income (and the ability to still tax salaries or transactions made in the market place) will be the real challenge for governments and businesses in the 21st century and beyond.