Seems like the FAA are jumping the gun here- I know they do not exactly get along with the NTSB but making a mandatory and significant change ahead of any conclusions seems rather more politically motivated than safety oriented.
Furthermore isn't there a serious question in this incident about mis- operation or misinterpretation of auto throttle modes.
If crews are deemed two tired or too inept to hand fly the approach but cannot understand some of the AP/AT features whats left?!