No doubt, but that comment was in regard to the long haul pilots having work, not domestic A330 crew, who would still be doing east coast runs as well.
With regard to A330 vs others that's now purely a QF consideration with no other airline operating the wide-bodies on that route so its all 737 and A320 traffic otherwise. In the days VA did it, there was a short run of good A330 coverage, but the last few years with yield management more and more 737 were being used to alleviate cost factor. Even in the US there is a move towards more cost effective large single aisle, with more A321 on order than ever, which shows they are over the issues the 757 was culled for, the expectation of long turn around times due to one aisle. QF is more unique, in that it has good corporate contracts so it can make profit on lower load factors due to its brand loyalty, something it's lived off for some time now.