The reduction in service has already happened with CX aping AC and going 10 seats per row which is still 9 per row on their asian leg. In a full plane , it is quite unbearable.
If you are concerned with comfort at a reasonable price, check China Airlines (Taiwan) which is flying a better airplane than CX and AC comfort wise. The price is often $100 to $150 more though but with 2x23kg checked baggage.