While I do agree that the 360 would bring ffxiv down because the ps3 is 2x as powerful, depending on how much I probably wouldnt mind a port. Also I dont think we would see too many 360 limitations because the 360 version would probably be the minority of the playerbase so SE could kill it before it was a problem.

Also (not trying to start the console war debate) I would imagine Microsoft doesnt want cross platform games because somthing that could run at a stable 60fps on ps3 could only run at 25-30fps on 360, because the specs of the 360 are that much worse than the ps3 especially in populated areas. FFXI would also be against it because there were so many problems with the 360 locking up, yes it was probably be down to the programming, but it rasied questions about the 360s quality, which could be another reason why MS dont want cross platform games.

As for the WiiU, I wouldnt say there is enough information about it yet, all I have found on the specs is a 45nm multicore IBM processor, and a 1GB graphics card based on ATI's Radeon 4000 series.

The CPU specs are a little short to say if it will run on WiiU because there is no clock speed or how many cores, a multicore CPU could mean dual core (which i do doubt it would) and we all know how dual core CPUs tend to run ffxiv on PC, however the WiiU would have dedecated gaming hardware that a PC doesnt have.

All things considered I would say its still too soon to speculate a possible WiiU release.