As a frequent flyer who is using CX for last 4 years as main airline, CX is still my default airline when doing business travels mainly because of its wide coverage of destinations and comparatively higher flight frequency.
Other than this, I don't see why CX cannot be replaced by other airlines.
LCC may not be my type of airline coz I am too bulky to fit in LCC's flights, but there are still non-LCC alternatives available in the market.