The arrangement that is being proposed with Turkey may well be the greatest betrayal in the entire history of European civilisation.
Let's examine the key elements of it:
Illegal immigrants not deemed worthy of asylum protection will be returned to Turkey but, in return, the EU will accept a "refugee" from Turkey who is deemed worthy of protection. In other words, there will be no diminution of numbers at all. Any amount of brown-skinned invaders can come to Europe from Turkey and Europe has to accept those numbers, even if not always the specific individuals. Moreover, the Turks will have a clear incentive to maximise the number of illegals making the crossing because each of them will then force the EU to take a "legitimate refugee" off its hands.
The Turks also get visa-free travel to Europe and a promise of accelerated EU accession talks, giving 80 million Muslims the right to colonise us without limit, as they have already colonised large parts of Germany and Austria.
They also get 6 billion euros (per year?) in addition to the billions of euros they already earn from the illegal smuggling trade, a business they have deliberately built up by granting visa-free travel to almost every Muslim country in the Middle East and North Africa.
Ever since they arrived in the Middle East from the eastern steppes, the Turks have always been the foremost external enemies of European civilisation (the Jews being the foremost internal enemies). Islam was actually in a fairly moribund state before the Turks arrived, converted to Islam and then rejuvenated it. The armies who defeated the crusaders consisted mainly of Turks. And the Turks went to successfully assault and capture one of the historic centres of European civilisation, Byzantium. They continued their aggressive expansion afterwards, only being stopped in epic sieges of Vienna and Malta and thanks to efforts of Spain in the 16th century, efforts that Spain was only empowered to make by the largely fortuitous arrival of gold from the Americas.
This "deal" may finally give the Turks the victory they have long sought over Europe. It is the profoundest betrayal we have ever seen. And all of this to partially mitigate a problem our own leaders created through their own weakness, folly and deranged spirit of do-gooderism.