It would be interesting to find out (because I really don't know) whether SFWA invited in indies authors because they wanted to expand their membership, or indie writers have been asking to get in for a while and SFWA opened the doors because they thought it was about time, and as a show of support. Or whether it was a bit of both. I suspect that it was both.
SFWA is good for networking, and affiliate members include artists, freelance editors, and other people who might be useful to self-published writers. So I imagine that, no matter how the decision came about, and who was actively pushing for the change, there have been indie writers who have felt left out and wanted in for a long time. They will be glad about this decision. For those who feel it doesn't benefit them, they'll be no different from traditionally published authors who feel the same. It's always been true that of those who can join, a lot of them don't want to, and I am not aware of any efforts to recruit them. But it's been years since I've been a member and a lot could have changed during that time.
They undoubtedly lost members over the sexism scandal -- people who were appalled by what was happening, people who liked things the way they were and thought that any change was trampling on their rights to use SFWA as a forum for their sexist views. Trad writers who never intended to join, or left in disgust at some point because of the politics (which can be very unpleasant for those who are drawn in), probably felt vindicated by the whole thing.