Even at the time of Prophet(P.B.U.H). When it was ordered that slavery should be prohibited, the Quraish(Non Muslims) start saying that if this has been implemented then who will work for them. If GCC remove slavery I welcome it as No doubt True Islamic Law is perfect, which is against slavery & no argument in order to support of "GCC sponsor-ship" as it is against Islamic Law . Allah says in Quran.

Qur'ân Al-Baqarah 2:177

" It is not Al-Birr (piety, righteousness, and each and every act of obedience to Allâh, etc.) that you turn your faces towards east and (or) west (in prayers); but Al-Birr is (the quality of) the one who believes in Allâh, the Last Day, the Angels, the Book, the Prophets and gives his wealth, in spite of love for it, to the kinsfolk, to the orphans, and to Al-Masâkin (the poor), and to the wayfarer, and to those who ask, and to set slaves free, performs As-Salât (Iqâmat-as-Salât), and gives the Zakât, and who fulfill their covenant when they make it, and who are As-Sâbirin (the patient ones, etc.) in extreme poverty and ailment (disease) and at the time of fighting (during the battles). Such are the people of the truth and they are Al­Muttaqûn (pious)."