would increase competition in the job market
competition is always a good thing for employers in a situation like that.
But why would anyone want to return to Poland to work in a similar job that they already have in Ireland, uk, etc where they're earning far more money?
I'm certainly not here by choice and if I could've got a job in Ireland, doing what I'm doing now, I'd be earning a hell of a lot more & would've had no reason to leave.
Until the wages in Poland come up to a competitive level with the jobs that are offered to Polish graduates abroad then the "brain-drain" will continue. I feel that it may be some time until that happens. The wage to work ratio in Poland is pretty bad, you can work your hole off and still not earn a wage that's anything special, whereas in Ireland, uk, etc I think that companies offer far more rewarding wages to jobs that require hard work. Here it's expected that you should still work hard even if the pay is crap.
I feel that the problem lies with Polish employers who seem to treat their employees as requirements to make them money rather than valuable assets who can help them make more money....and changing a mindset doesn't happen overnight. If you take the Irish example, the roots of the Celtic Tiger can be traced back to the 1960s when Lemass was Irish PM, however, it wasn't until the 90s that everyone started to have some money in their pockets.