Something in this.
During the tech bubble (the first one) companies could always get people to keep logging in, checking their email and answering their cell phones every evening of the week and right through the weekends. But these folks were getting lots of stock options so they had the very real possibility, even probability, of becoming millionaires in a few years. The companies also usually paid for their home internet and cell phone. Then around 5 or 6 years ago (at a huge and successful tech company), I witnessed it change overnight. No more stock options for any grunts or lower management. No more paying for your home internet or cell phone. They even got rid of the free bottled water, juice and soda in the break rooms and replaced them with vending machines. Yet the company acted like the job description was still, "Whatever it takes." I moved on and didn't get to see the long term result of this, but I thought at the time that this is a tectonic change in North American hi tech. Once the stock options and perks are removed then ***? And needless to say the foreign contractors we were forced to deal with NEVER had to put in extra time, and it was the North Americans who had to log in at all hours for teleconferences etc. and help them do their jobs.
So not only will foreign workers not put up wit dat, I have a feeling that unless American techies are really dedicated or really scared for their jobs, they won't be doing a lot of that either.