While the ELCA has its liberal groups, I see adopting this policy as likely to split many of the synods(church districts) and cause individual churches to give up their ELCA affiliation.
The ELCA is slowly losing congregations already. The churches leaving the denomination have been few but outnumbering the new congregations being established.
Depending on how this Assembly in August is handled, there could well be a serious increase in departures of congregations, as well as a significant outflow of individual members and their families. From the drift of actions so far, the future of the ELCA doesn't look good.