I think the general consensus is there is no consensus..
some like it, some don't... the answer that satisfies everyone is to make it a choice, i.e. in the 747 bubble.
But this is not going to happen. Depite the spin, this is clearly an 'enhancement' exercise... i.e. costcutting on the shorter overnight flights. To load two lots of catering, print two lots of menus, have two different FA service schedules, and then not be able to guarentee the proportion of either is not going to cut costs, its going to increase them.
I suspect this idea will either die a natural death or be implemented regardless (due to customer feedback of course!
)