Unless CX goes with a 2-2-2 configuration (either Collins Diamond without direct aisle access or Safran Optima), I don't see any practical reasons to not just install the Aria product other than potentially the cost of the hardware. As can be seen with the 77J reconfiguration, Aria is a very space efficient product - even going with either of the vastly inferior seats above would only increase the seat count by one or two pairs depending on the willingness to relocate lavatories and galley.