The 787 replaced the 767 in Boeing's lineup, which in turn was competitor of the 350. The 747 is still incredibly successful for cargo, so the 380 didn't replace it; it is absolutely nuts that AirBus didn't come up with a cargo version of the 380 yet.
Next up is the 777, which has higher capacity than the 787/350. However, it is modern enough that it can probably just be upgraded, no new plane is needed.
Next up is the 777, which has higher capacity than the 787/350. However, it is modern enough that it can probably just be upgraded, no new plane is needed.