>>279981701On things that will never happen this one probably will not happen the least but here we go:
The world of zero no tsukaima is fairly rich and versatile, at least most new fans are left wanting more. The anime itself had a golden brochure so there isn't a good rationale for a 5th season.
However the possibilities are endless and there is enough slack to put side dish OVAs anywhen.
Even better would be a Fate style retellings with different shifts, Drama Henrietta route, Slice of Life Siesta Route, real world does a special military operation on halkeginia. The actual Light Novel climax was amazing despite having an inferior epilogue to the anime, it's left to adapt in theory.
Ultimately the biggest barrier is philosophical, Do we really need more? How ethical is to reanimate a series posthumously, is there even a point to redo products-of-its-time