Speedbirdhouse,
SQ in most cases put all their crew on all of the aircraft from the start, just usually not in F or J. Although J is done quite early on after a few flights down the back, but F is not until they are mature! (in fact have been promoted to Leading crew grade).
They also do long haul flights right from day 1, they dont just travel short regional flights as they are trained and rostered by a.c type and that would be impossible to roster.
With QF, could we honestly say that the QF Brand will be destroyed by new crew only operating the A380...lets be fair whilst no one likes to see conditions deteriorating...QF is hardly renowned for its inflight service. In fact its quite the opposite.