their blackjack tables and install slot machines in the floor space the tables are taking? Wouldn't the casinos earn more per square foot and have a lot less trouble with fewer employees to be concerned with? And the coinless (ticket only) slots have such little upkeep or attention needed by the casinos that the earnings on them are practically all profit.

What's the incentive to keep blackjack? Maybe there are still gamblers that prefer sitting & playing blackjack, but do the casinos make as much off them as they do the slot machines?