1) there is no technical reason why the existing EK A380 fleet could not have new engines installed via STC/factory mod
2) the A380 engine thrust class is in the same thrust class as the medium size twin engine widebodies, so it can leverage from those programs
3) Historically 747, KC135, DC8 have all gone through this process to extend their lives.
Certainly feasible, and likely a re-engine has previously been discussed.
EK used Airbus goodwill to influence RR to sign for the 2nd tranche of RR powered A380's when EA wouldn't even price. EK wanted an EA PiP to address performance erosion, and RR was already in performance erosion discussions.
Against this background new engine options were likely discussed, but no consensus on sharing development costs, unit price and performance guarantees, and the financial basis of how T900 maintenance contracts were terminated (most are 12+2 - a liability for EK and lessor if withdrawn early, but an ongoing support cost also for RR).
Years forward, and post-MAX grounding, certification hurdles for a re-engine are higher, not only cost, but also the ability (and likely desire) of EASA and FAA to review / update what they perceive as issues with the original air frame. In a 2022 environment, the CV580 and DC8 7 series conversions probably would be less likely.
Never say never though. When you price an engine conversion with the cost of an interior upgrade...... Get BA on board and perhaps one other operator........... Package a 787 order conditional with a GE A380 re-engine (or A35 with a RR re-engine).... Terminate existing Trent 900 full service contracts to both parties mutual advantage...... And not impossible Airbus still has skin in the game, if the last 2 tranches include buyback options.
Zeke. It's feasible. FPE. It's not impossible discussions have been re-activated (or EK are attempting to link to new model orders). Every month makes it less likely, but.....