Upon hearing from Malcolm Donaldson that NWSL was closing down this month, I emailed Fred and asked him about it. According to Fred, NWSL is indeed for sale -and has been for about a year- but he mentioned no plans to close down this month or indeed in the near future.
So unless Fred is fibbing for some obscure business purposes, you can expect NWSL to yet be around for a while.
-Pete