A true coalition for now is a pipe dream. And until and unless Iran, Iraq and Syria are included, and the war in Yemen ended immediately, this will never be a real coalition that lives up to its name.
If the stated purpose is to fight terror and ISIL in particular, then it's a welcome move, but one has to wonder the allegiance of local powers to other unsavoury organisations such as Al Nusrah, and all their support for sectarian factions, as well as the aforementioned war in Yemen. The situation in Syria and the coalition members support for rebel groups and involvement is another affront to any real notions of a coalition.
Pakistan should remain strictly neutral on any attempted sectarian shit-shovelling that can and will go on, and steer clear of any stated support for any faction or party in either Syria or Yemen. Those are not our conflicts, and the problems the Saudis and other Arabs have with the Iranians, and vice versa, are not our problems.
Also, I'm not sure why the author of the article keeps citing the US' clear failure in the war on terror, and why he keeps citing the disapproval of Muslims in the region to US hegemony as motivation for this coalition. That's a great joke, this coalition as with any coalition the Saudis are involved with comes with Uncle Sam's stamp of approval, they probably played some role in setting it up for all we know. Of course there isn't anything wrong with that per se, depending on your opinions on the matter, but let's not kid ourselves here.