If ALPA, or any other union, pushes the average on wages, conditions, or benefits upward, it does benefit the industry. All the other companies will feel the effects in hiring and turnover eventually, and have to move in the same direction to remain competitive.
What amazes me is the number of folks who not not recognize the built-in conflicts of interest for ALPA in representing both Regional and Legacy pilots. True, some of their needs are the same, but some are clearly not and never will be.
Scope isn't just a mouthwash.