Every time +Motorola Mobility
posts on G+ regarding the Moto X a lot of followers outside North America ask why the Moto X is not coming to their country. I don't know why Motorola isn't answering these questions (maybe their G+ admin is not authorized to), but I believe it's because the customized Moto X is assembled in the U.S. and in order to ship worldwide would be prohibitively expensive and time-consuming. Also, I'm guessing the assembly line isn't capable of the capacity that would require.
Motorola is introducing a new phone this Wednesday called the "Moto G", which is rumored to be for the world markets. It may not be customizable and is rumored to be a lower-end phone than the Moto X. If you want the high end features of the Moto X the similarly featured Ultra, Mini and MAXX are available worldwide, aren't they?
If Motorola were to make the MotoMaker experience worldwide they'd likely have to have multiple assembly factories around the world for it and that's probably just not profitable for them.