I'd hardy say CX is flourishing as it chose to put in a Dublin service rather than up the MAN service which it easily could have done to consolidate, & Hanain isn't looking good either.
Singapore has never had more than one daily flight to Changi in 40 years I think?
The airlines who come in on long haul and sustain double daily in a few years tend to be two ME rivals, one of which is blockading the other at time of writing, and even Emirates is still one daily at NCL after all this time. Surely if Cathay need more capacity, the A350-1000 would be the first option rather than another flight?