A number of possibilities:
1. They keep the CI400 to allow a more accurate reporting time to reflect reality. The CI400 stays until fully EASA compliant, including FTLs, which I understand are less restrictive for most reporting time windows. Then reduce CI, and keep the more realistic reporting time and original schedule.
2. Keep CI400 until we recruit a LOT more pilots, and we find more augmenting, then CI reduces.
3. Keep CI400 while fuel prices are low, squeeze current crews for hours, reassess in a year or two.
4. Emirates want to improve their punctuality record. It's finally been revealed that a dispatcher's "5 mins for bags Captain" is actually on the dog-year scale.
I'm between 1 and 4.