I agree,I would even go as far to say that New Crystal do not really want solo travellers by how they are segregating them on deck seven forward.
Yes they do need to make money and solo travellers with a big discount taking up a double occupancy veranda or larger suite takes some of the profit that could have been.
If the rooms on deck seven do not sell ,which I suspect,Crystal will use them for guest entertainers,higher ranking crew and have them spare for emergency room changes as they have done on the past.
Of course solo travellers would be welcomed if they pay double and only drink and eat for one.