I don't think Airbus can afford to discontinue the A380.
Airbus has sold zero A380s this year. If they sell the same number the following year (or even just sell them in single digits), Airbus could not even hope to continue production.
Rolls Royce shares would take a dive
Really? Why? The A380 engine market is a small niche market, with no other aircraft using the engines used on the A380. And within that small market, most of the A380's do not even use RR engines.