That is right, it may not be humanly possible to handhold at 1/1.5s, but as you're referring to VR lens, then the limit will be highly determined by the capabilities and algorithm of the VR controller itself, rather than the human hand.
additional info for Zack:
The "rule of thumb" saying that minimum handholding speed is 1/f, is true for full frame 35 mm system or focal length equivalent to 35 mm system. Therefore if let's say, a compact digicam with 7 mm lens, it does not mean the minimum speed should be 1/7s, but must be derived from its 35mm equivalent. If that 7mm focal length results in 28mm equivalent (on 35mm system), then the minimum handholding speed is 1/28s
Further on that, if you want to be precise, that "rule of thumb" will also relate to the final reproduction ratio. If the final image will be printed at 4R, handholding at 1/f is good. But will it still be good if the final image be printed at poster size? probably not.