It's not about perspective. It's about the fact that this mythical commonality that does not in fact exist is a mask for the complete and utter lack of national identity. We say "Arab World" when a rural Moroccan Berber Sunni has almost nothing in common with a Damascene Alawi. Yet the myth is there, and the myth itself is probably inhibiting any sense of common purpose or shared destiny. It would be as if Spaniards, French and Italians called themselves "Roman" and failed to create unified states as a result (and actually, that pretty much happened in Italy for the longest time, with the predictable consequences).
The sooner the entire region starts to recognize the realities, the sooner they will form states based on common interest. Aside from the fact that ISIS is a horrendous group, the geographical area that it controlled fell to it quickly for a reason - the Sunni regions of Iraq and Syria had more in common with one another than they did with their "countrymen". The Upper Mesopotamian geographical area has been distinct since they time of the Assyrians and makes a much more logical grouping than Iraq and Syria do. Lower Mesopotamia would be a Shiite state, the mountains of Kurdistan would be a state, and the Levantine coast would be a state.
ἡ δὲ κἀκ τριῶν τρυπημάτων ἐργαζομένη ἐνεκάλει τῇ φύσει, δυσφορουμένη, ὅτι δὴ μὴ καὶ τοὺς τιτθοὺς αὐτῇ εὐρύτερον ἢ νῦν εἰσι τρυπώη, ὅπως καὶ ἄλλην ἐνταῦθα μίξιν ἐπιτεχνᾶσθαι δυνατὴ εἴη. – Procopius
Ummaka qinnassa nīk!
*MySmiley*