This really isn't that big of a deal, all they are saying is they may allow individual troops to decide how to handle it, instead of having a national ban.
We have been through this before, when the BSA changed policy to allow women to be Scoutmasters. Back in the 20's and 30's there was a high level of virulent racism in Scouting (like the society in general) that had to be quietly discouraged. The fundamental dynamic is that BSA establishes policies which all Scouting units must adhere to and the sponsoring organizations require certain additional policies consistent with their beliefs (as long as they do not conflict with the BSA standards). So a Mormon-sponsored troop can decide that the Scoutmaster must be male and receive his position as a calling from the church.
Over the years I have been involved in most of the "evolving standards" of the BSA:
1. racial discrimination
2. religious bigotry
3. excess militarism; jingoism vs patriotism
4. child safety (predators)
5. child safety (lack of supervision and adherence to safety standards)
6. role of women as adult leaders
7. status of female youth members in Venture and Varsity Scouting programs
8. the Unitarian debacle
9. definition of "atheism" and religious tests for membership (most Buddhists, Taoists, Confucians, and a number of other established faiths are technically "atheist" in that they do not believe in personified gods, which are apparently the only ones a lot of Christians and Muslims consider, making the aforementioned groups and many Jews, native American practitioners, animists, etc. "heathens" and "atheists".
10. relationship to the World Scouting Movement
As the above should make clear, a Buddhist-sponsored troop which has no objection to homosexuality is not currently allowed to choose a gay Scoutmaster, regardless of the suitability of the person to the sponsoring organization. This is basically regarded as an indication of religious intolerance by most of the World Scouting Movement. Thus American Scouting is often felt to be in violation of the basic principles and values of the founders of Scouting. This is my opinion also. How long Scouting can survive in the United States as a captive of culture wars is an open question.
For the record, I have been a Cub Scout, Boy Scout, Explorer, and adult leader most of my life, and a Wood Badge Beaver; my two sons are Eagle Scouts and Vigil Members of the OA (as am I) and we have served on NOAC ICE staff for a number of years; my father was a Council President and with others established the largest annual Scouting event in the country and was a Silver Beaver back in the 50's; and I count as friends several members of the BSA National Committee and OA Committee. I have had the great privilege to know Tom Cochran and Bill Hillcourt and to have met E Urner Goodman.
And for all the Wood Badge folks, I try to follow Bill's admonition to "Never stop working your ticket!"