Kitase/Nomura are the problem, I would bet every suit at Square-Enix would love to have a FF7 Remake. Though I bet they will hedge if the higher ups at the company lay down the law.
PS3-only is not happening for a title like this though. This last year where S-E announced they're porting FF13 to the 360 and Dragon Quest X is now a Wii title shows they are moving far away from Sony exclusivity.
The Square-Sony era of the late 90s-2000s is over IMO.