One can't go back to that which one has never left.

For the time being, and the foreseeable future, there are reasons why earlier versions of Office still dominate business, government, and household computing:
Purchase costs
Implementation costs
Training costs
Adaptation costs

Costs in time and money.
Costs in frustration and delays.

We're in a recession, maybe a depression, remember? One of the worst in history.

Personally, I use Office 2010 and don't find the ribbons an obstacle. But I'm a nerd and a tech with close to thirty years of computer experience, and professional levels of knowledge, and I've learned to never, never confuse my experience with new products and technologies with that of the general public.

What I find obvious, easy, and entertaining is often opaque, confusing, difficult, frustrating, and sometimes even insurmountable for my clients and students.