Whenever an issue is settled they can't use it to ask for donations. As long as the problem lasts forever they can make money from it. The goal of an organization is that which brings in the money.
Abortion has been a hot-button issue for half a century. It's not that easy to find issues which inspire so much slobbering from the conservative base - because this one is at the intersection of women's rights, babies, and overbearing government responses, conservatives lose their minds over it. It's also a doomed cause - the recent SC mifiprestone case cited that the number of abortions happening in southern states is now greater than it was before the ban.
They're not abandoning this issue, no matter how many GOP leaders force their mistresses into abortions. It's just too good at mobilizing the base.