Casinos needed racing to get established. Now that they are, they find themselves in an Odd Couple relationship. Casinos make money, racing leeches it off of them.
It is a no-brainer for casinos - they no longer need the tracks. Governments know it. The tracks probably have no clue, as in most things they are involved in.
It would be stupid for casinos to not want to get free from the tracks and go on their own. The influx of money was supposed to drive up purses and improve racing. How'd that work out at Aqueduct - the Graveyard of Entries. Apparently, you can't pay people to race at the Big A. :lola