We can perhaps cast the 'Deluxe' term aside for the story progression discussion. Some folks may be referring to boxed expansions in general. The evergreen 'Deluxe' expansion format will continue for L5R, afaik.
The question is how happy would people be with further boxed products, along the lines of A/NR campaign expansion (base game cost), LOTR Saga expansion (Deluxe expansion cost). Ignoring the specific mechanics in those, but imagine what such a product could contain in terms of interactive narrative potential outside the rotation.
Hurdles:
-Should this only happen after enough Deluxe releases have fleshed out all the clans.
-Would this requirement be a financial barrier for too many. Though participation and story could be provided without purchase.
Personally, take my money FFG. Apply your production and design to whatever extent you wish but provide as many options as you can to be inclusive. You can think outside of the box plenty more for the LCG format.