but go through the effort of a 777 vs 747-800 CCQ?
CX are studying at Boeing's request and thats all it is, a feasibility study. It might go nowhere. Apparently the 777 fleet office has been saying that it would only be for a select group of pilots anyway which makes sense. No point in CCQing nearly 1000+ pilots for a 748 they might fly only once every couple of months anyway. No economical benefit.
I have heard that the 350 will be a standalone fleet initially but that once more 350s come online and once it is more likely that the regular line pilot will fly both types enough to maintain recency on them both, they will be CCQed, but thats towards the end of the decade.