Quote Originally Posted by PeaTearGriffin View Post
Also won't somebody please for the love of god think of the poor shareholders?
Yes... please think of me... I've had shares in Squaresoft and Enix before the merger... >.>

Engine is basically the heart or core of the game. While possible to upgrade it will either result in having to remake all associated assets along with the engine which as ppl said will basically be making a new game. Or Upgrading the existing engine itself keeping compatibility with existing assets which will normally severely limit what you can do in regards to upgrading it. FFXIV also has another issue however often referred to as spaghetti code where code as changed a bit at certain points resulting in layers that rely on the current engine to keep from unraveling.