Interesting Bit of Speculation Regarding Game engine

[Seraphor]

It doesn't matter how familiar Yoshi P is with XVI's engine, converting XIV to run on another engine isn't going to be an easy or cheap task.
I wouldn't hold out any hope for an engine overhaul until we hear anything from the horses mouth to suggest such a thing.
Speculating that a graphical overhaul could also come with a new engine, is quite a reach.

That said, I'm sure there's been a suggestion that XVI itself is running on a modified Luminous Engine anyway. If this is true, then it shouldn't be a stretch to more XIV over to that same modified engine, but at the same time, there's nothing there to suggest that would improve XIV all that much. MMOs and single player games work very differently.