I agree that the cabin crew are an asset. I have flown twice with Oasis and been pleasantly surprised. I think Hailer may be referring more to the other areas of the workforce and especially the Commercial side. They might be charming but you need them to be ruthless.
Plus I don't think the Easyjet analogy is a good one. Yes, they fly from some first tier airports but they spread this over a network that includes lots of second tier destinations. And they only fly short haul, so tougher to make the comparison with Oasis anyway. I would be surprised if Air Asia X ends up flying from many tier one airports.
The Chinese are travelling more and more certainly but is Oasis well placed to access large numbers of Mainlanders? Maybe a tie up with HKA or HKE is underway/planned?
All-in-all, maybe Oasis will make a go of it and you have to respect them for trying. But the jury has to be out until they can prove that they can grow into the next phase.