Investors, whoever they may be, are after three things:
Dividend when possible
Increase in the value of their shares and investment
Profitable and stable company to continue investing in.
They don't care about the terms and conditions of either the pilots, engineers, ground staff or cabin crew. That is what the elected board members are there for to sort all that out. They want a profitable bottom line and will very likely back the CEO to the hilt if the current changes achieve this.
I have not seen anything on the investment markets that says that the markets think that Willie Walsh is barking up the wrong tree. Quite the opposite in fact!