FWIW, I note that the NOAA images all are "cranked up" and are showing massive ground clutter. I'd bet that simply turning on ground clutter suppression (subtraction) would reduce the windfarm effect significantly.
Personally, on my bookmarked WUnderground.com radar views, I keep ground clutter suppression "ON". The signals from actual dangerous weather are so strong that they are diminished hardly at all.
The simple act of animating ("looping") the radar displays makes it immediately obvious that the windfarm signals are stationary. As such, they are easy to ignore or discount.
IOW, this is much ado about nothing...
One problem with your thoughts, the windmills are moving, it is not like a building. The radar display showing the farms changes, it comes and goes. The local weather guy has no answer.