IMO they brought it all on themselves.  They took their bread and butter and made it so others can profit on it from their own customers and future customers in other jurisdictions. 

https://www.8newsnow.com/news/local-news/las-vegas-casino-dealers-face-layoffs-amid-tourism-slump/

Read into anyway you want but I know they caused it all themselves.  It all began around 2013-2015 with the revamping of the two largest brands, points and promotional programs.  Then the rising on all prices by the branded chains as well as the local establishments, etc., and so on. 

They have to (HAVE TO) do something and it is starting.

https://www.reviewjournal.com/business/casinos-gaming/strip-casino-ditching-resort-fees-this-summer-3387482/

Wow.

Could they put any more advertising on that web page?

AD

The drop in visitation to Las Vegas and decline in hotel occupancy show no signs of slowing down over the summer, considering the reports that came out last week.

https://cdcgaming.com/las-vegas-drop-in-tourism-and-gaming-revenue-shows-no-sign-of-slowing/

It's likely that the global warming effect will make things worse and worse...
Are there many reasons to visit one of the hottest places in the world during the summer?

Then Vegas prices keep rising...a Gordon Ramsey hamburger starts at $29, the few buffets still alive cost around $50 or more, the suggested minimum tip on the bills raised from 15% to 18% and so on.

There are no free parking at any Strip hotel/casino, I guess that there's no point to pay for parking the vehicle at premises where you are supposed to drop serious money at them.

Not surprised that off Strip casinos are experiencing a better action (free parking, lower food and beverage prices, best promotions in town, better payouts at slot machines, etc)

Gamblers and visitors in general want to get a proper value after the money spent in Vegas (as it  was in the past), especially knowing that by now casinos and many forms of entertainment abound everywhere.

as.