Which borders?
German borders!
We found out the hard way that our brilliant plan(s) to make our neighbours responsible for all outer-EU-immigrants didn't work. Our beloved neighbours showed Berlin the finger and just waved the incomers on, knowing they mostly want to go to Germany anyhow....
So...all these nice ideas are for the dustbin....there is not much else beside the ultima ratio securing the EU outer borders...not leaving it to these countries alone, which happen to be on the outside, but paying them, sending troops, arming them...the whole nine yards. Then we could keep the inner EU-borders, the inner EU-travel, the inner EU-trade etc. open....but we are not there yet.