It'll take a lot of weighing up definitely but if they did an 800NC you then have a 77W thrashing frame, same-ish pax, more cargo and possibly more range (higher MTOW and more attractive too due to less seats than A388 so easier to fill) and then the 900NC would be an "everything" thrashing plane if they made it long enough to carry the same pax as current A380's but with the extra cargo, something like 15 pallets on the main deck. Emirates would lap them up and I'm sure they would become a more attractive aircraft. Extremely idealistic but up against the 77X it will have to be really special, like Dubai-West coast USA with full pax, full cargo year round.
What exactly will this development fund do btw?