In the last decade - or more - turnovers have not made any race a revenue-positive area, is my understanding. The lesser-staked meetings just lose less, that's all.
Which is [ one reason ] why the wail about abandoned meetings costing millions is a crock. No stakes to pay out, no ancillary costs either, only costs are on the beleaguered stakeholders who in many cases have outlaid money for transport, staff wages, etc, for the raceday.
So yes, novelty aside, I would think we would be in the same place as before wrt revenue. There seems to be little evidence statistically to indicate that betting will be worse, despite many comments about punters hating allweathers. Obviously, some do, but equally, others may not. After all, people bet on greyhounds, which I find an utter bore-fest - even though I love dogs, and have a rehomed greyhound. Can't see that there will be any significant change in punting behaviour really, although I'm no statistical expert.