I love this idea!!! That way you can also tell if the park is busy or not, and worth the trip out if you're visiting from across suburbs or from another town or city. Nothing worse than driving for an hour to a theme park and finding 90 minute waits for rides
I would also like to suggest is making more of a big deal about attraction/ride maintenance. I do understand that there's currently a specific page for this on each theme park website, but there's nothing listed on the individual ride pages about them being closed at the time. I see a lot of complaints stem from disappointment of rides being unexpectedly closed, and knowing how much tourists pay for their tickets and passes, it would definitely be beneficial for the parks to try and make it as obvious as possible when attractions are down or unavailable - maybe even a rolling update on the purchase pages themselves?
Either way, I think that this would cut back on complaints/negative reviews, as it means that guests can either consider visiting another day or another time if they aren't happy with the current offerings at that time.