Ray: Hold your horses, there's been some talk that DMM is actually the one that pulled the plug. Personally, if this is true, I wouldn't want to throw any business their way.
Personally, I think I'll continue to log in, but just for rewards and gifts, go on a roll spree, and try to get the scenes before it all ends. Then I'll throw investment into FGO. Gotta get that gatcha itch somehow.