Forgive me, but I also feel that the whole world turning to Islam is the essence of Dr. Shabbir's post. The two Ayahs cited by Dr. Shabbir clearly confirm this idea:
9:32 They seek to extinguish God’s light (the Quran) by their utterances. But God will not allow this to pass, for He has willed to spread His light in all its fullness even though the rejecters may detest it.
9:33 He is the One Who has sent His Messenger with guidance and the True Religion (The Divinely Prescribed System of Life), that He may cause it to prevail over all religions and systems of life, even though the idolaters may detest it.
The above ayahs seem to be very forthright and clear indeed.
If you don't agree that the whole world will one day be in the fold of Islam (as the above Ayahs indicate), kindly enlighten us as to what you think is the meaning of these Ayahs.