The 330/340 were originally 2-4-2. Some asian carriers are now squeezing in 3-3-3. Very tight. I just sat in one. It sucked.

I think 9 across is the sweet spot for double isle. Anything else is structurally/space inefficient. 7 across we will never see again, unless it was narrow body 3-4 across. That would be too painful to board/service etc.

The 330NEO is going to be hard to compete against when you add it the cost of the aircraft. I think Boeing is doing smoke and mirrors.