"On September 1, 2017, FamilySearch will discontinue its microfilm distribution services. (The last day to order microfilm will be on August 31, 2017.) The change is the result of significant progress made in FamilySearch’s microfilm digitization efforts and the obsolescence of microfilm technology. The remaining microfilms should be digitized by the end of 2020."
The announcement did not say that everything they digitize will actually be available, and if so, on their free site or on their subscription site. Also note that there is a 3 year gap between them ending the microfilm rental service and them having the existing records fully digitized. That may present a 3-year problem for your Mayflower, DAR, SAR, Colonial Dames of the XVII Century, Daughters of Founders and Patriots of America, DUVCW, SUVCW, New England Women, Daughters of Colonial Wars, U.S. Daughters of 1812, the General Society War of 1812, etc. etc. application.
Local Family History Centers "have the option to return microfilm that is available online or otherwise not needed. As more images are published online, centers may reevaluate whether to retain microfilm holdings." So, if you are a volunteer at your local FHC, make sure you are in on that conversation.