Oh there was definately consideration. Those pictures were coupled with a poll on their website asking the preference of minimal parts vs a more complete swap kit (whole legs IIRC).
It would have been a mark of loyalty to the fans who to release the upgrades and we would have paid for the costs. But it wasn't to be.
I would prefer Yamato just started doing more 1/60 Super Valkyries (at least a CF if nothing else), though I'd prefer they revised the line before doing so, incorporating some 1/48 elements (at least the telescoping feet, radome, and flaps, if not the transformation). I personally can live with removable legs. It's not like a 1/48 can transform in any semblence of the time it takes in the anime.