I don't see where the upside to this survey is for maintaining their anti gay policies.
They are already losing their funding and the PR battle. If an anti gay consensus emerges from this survey, it will do nothing to change this ever increasing fact.
If however, a more tolerant viewpoint emerges from the broader membership, vs the current leadership, the survey results could be used to marginalize the hardliners within, and offer cover for changes.
The wording also appears to explore the option of local chapter decision making. While not ideal, that would be an incremental step in the right direction, like the state by state legitimizing of gay marriage. Funding could theoretically be restored for the organization with the stipulation that none of it goes to discriminatory chapters. This would further ostracize those factions while allowing competing, nondiscriminatory chapters within the same local community to enjoy the funds.