Generation generalizations aside, don't we all want better company culture? I agree with most of the article's assertions about the shifts in company culture and how things like ROWE, unlimited vacation, and (shocking) a respectful culture are part of attracting and retaining top talent. However, I'm not as comfortable with attributing the cause of this shift to sweeping assumptions about an entire age group. In my experience, the differences between individuals within a generation are as great or greater than the differences between generations.

What do you think? Is company culture changing largely because of demographic shifts in the working population or is there another cause?

Not everyone wants better culture. At almost any large corporation, there is a deep, hierarchical power structure
and the people in power are interested in maintaining their power.
It is one of the greatest reasons companies fail after a long string of success - corporations create an environment where employees get a better return on their career playing politics than delivering excellent products and experiences to customers.