I am not a computer genius but I have a question.

They announced their new engine using directx 11 technology last week or so (well there was a thread reporting it last week) and people said that it was most likely be used for their new MMO, which very well could be, and that moving FFXIV would be practically impossible.

My question is why? If their new engine uses the same programming structure, wouldn't it be possible to port it in this new optimized (hopefully) engine?