You're right. This is going to cause MAJOR havoc for most electronic devices, unless they run only on batteries. As an example, European televisions run on 50 Hz. Try running a European model TV on 60 Hz. and see what happens. Some brands have a switch on them so you can switch between 50 and 60 Hz.
Read post 49.
Readers; this FERC pdf shows the history of the the frequency response project.
http://www.nerc.com/filez/standards/Frequency_Response.html