I would guess full-time grass racing is out because there is now so much money tied up in breeding horses to race on the dirt---making those sires worthless isn't going to happen without a long fight.

I'm a novice compared to most of you, but I don't see the evidence that Polytrack is a great savior in any respect. So far all we've seen is that it MIGHT be safer than some dirt tracks (if Turfway ends up with as many breakdowns as they used to have on "regular dirt" then what's the point?), and it MIGHT not hurt betting handle. Even accepting that the first point is more important, I don't see the proof in favor of Polytrack yet. Why not take it slowly? Maybe with some tinkering it will turn out to be safer, but I keep thinking of artificial turf in professional sports and how that turned out...grass truly is the real "natural" surface, isn't it?