Of course, the short-sighted investors will drive the stock price down, and Boeing will cut more corners in other plane models, instead of driving the stock price up to fund safety efforts.
The entire world relies on Boeing and Airbus, if they shut down the world's economy will grind to a halt, FedEx/UPS/USPS/DHL will stop functioning, executives can't travel, emergency medical care will cease to exist, families will be isolated, and tourism will die.
Their budgets for safety efforts and R&D for the transportation of ALL of the above and trillions of dollars worth of global economy should NOT be at the mercy of some armchair hooligans on Wall Street.