This was posted to the ACS Data Users forum by Mark Mather of the Population Reference Bureau.  He writes:

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"The Census Bureau is planning to discontinue the production of all 3-year ACS data, according to their 2015 budget justification document:

"The Census Bureau proposes to terminate permanently the “3-Year Data” Product. The Census Bureau intended to produce this data product for a few years when the ACS was a new survey. Now that the ACS has collected data for nearly a decade, this product can be discontinued without serious
impacts on the availability of the estimates for these communities."

http://www.osec.doc.gov/bmi/budget/FY16CJ/Census_2016_CJ.pdf"

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The paragraph in question is on pg. CEN 106.  Mark's post is at http://acsdatacommunity.leveragesoftware.com/group_discussion.aspx?discussionid=b5a6987a347440c38d72dc0d5f5a6f67&messageid=b2316c2b8af649b7ad3f9d97c1407f93

Mara Kaminowitz, GISP
GIS Coordinator
.........................................................................
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD  21230
410-732-0500 ext. 1030
mkaminowitz@baltometro.org
www.baltometro.org