It may affect an airline's revenue, but it won't affect airline revenue. The beancounters are prepared to take the gamble that it won't happen to their airline. The same is true of railroad operations - Lac Megantic being a prime example. The CEOs, etc take a gamble that it won't happen on their watch, but the monetary savings always boost their bonuses.
The principle operates almost everywhere these days. You won't get a road crossing installed until somebody dies. One cannot legally prove that any particular safety measure saves lives, so they won't happen.
Equally, vast numbers of unnecessary safety measures and banning happen where there is the risk of being sued, because that will cost money.
In summary, the two questions are:
Can I save money this financial year?
Will we get sued?
The solution to the second one is to get your cuts approved by the regulatory body. This can be achieved 3 ways.
Bribe the civil servants
Bribe the politicians to change the rules
Get the size of the regulatory body reduced so they can't effectively enforce the existing rules.