Ooooooookkkkkkaaaaaayyyyyyyyyyy ...
For those talking about runway shooting, let's revisit the original question ..
Is VR really useful for motorsports?
Maybe the Champ cars at mid-Ohio counts, but as a general rule ..
Similarly those talking about flash photography, IME, using flash for motorsports photography, other than rallies, is generally ineffective due to the large flash to subject distances involved.
Answering the question, yes, VR can be and is useful, but it depends upon where you are relative to the subject matter and what you're shooting.
Often, when shooting motorsports - and other fast moving activities - a faster shutterspeed is exactly what you do not want. Let's say that you want a panning image of a car going past, or perhaps you want to catch the rotation of the wheels.
What about shooting in cloudy, darker conditions, when faster shutter speeds are not as readily available?
By its very nature, most motorsports photography dictates that you will be using a longer lens of some sort, and that means that you will have a restriction on the theoretical slowest shutter speed you can use.
VR helps you to use your lenses at lower shutter speeds than the theoretical minimums, whilst helping to control camera shake. Thus you can still get those sorts of shots (I've described above) without the overhead of having to carry a pod of some sort.
So, yes, it's still useful, but it depends upon what and how you're shooting. It's jst one extra tool at your disposal.