As of December 21, 2015, it appears that the days of AMA only R/C flying are over.
The FAA has decreed that all unmanned aircraft, ranging from half a pound and up to/including 55 pounds must be registered (at a 2015 cost of $5) in order to use US airspace. Presently this is a single registration for any number of planes/helicopters/multicopters. But the other requirement is that this registration must re-occur every 3 years.
Registration starts on December 21, 2015. In order to avoid fines (up to $27,500 USD) all R/C aviators must register before February 19, 2016. Please note that FAA has made clear that any information provided to them as part of registration will be made available/searchable to the public.
For details directly from the FAA, please visit their UAS site: https://www.faa.gov/uas/registration/
Or if you want to let the AMA know your feelings on the topic, contact them here: http://www.modelaircraft.org/aboutama/Organization/hqstaff.aspx