I honestly believe CX is the epitome of luxury today in their First, and I highly doubt they will change for a while. I personally prefer CX F to SQ including suites, EK suites, EY Etc.
I think they opted clearly to have a First class product that was open, spacious and airy, yet extremely private. When you are in your "cocoon" you can hardly see another passenger.

There is clearly enough distinction between First and Biz products (something fellow oneworld airline BA failed to maintain when they updated Club and let First call behind).

To answer your question, I don't see them need to touch a very well received product for a while, as long as they continue good up keep which they are known to do.