It also has to be developed using SE Crystal Tools (or whatever engine they use now... was Crystal Tools the old one?) - the people implementing it have to be understanding of the code of FFXIV. In essence, it'd be a case of hiring new people. Then training them etc. I believe Yoshi P has gone on record saying finding appropriate developers (that can speak Japanese, which is what they communicate with each other using) is extremely difficult. Thus, while I can see where you're going with this, it is not as simple as that.