I haven't kept up with it in recent years, but I know it remained popular in Japan for many years longer than elsewhere. AFAIK since 2011 it has been developed by a Japanese company, who acquired Six Apart's former subsidiary there, as well as the brand name.

It's also interesting that so many people in this thread are saying "What I really need is a SSG that also works as a CMS with a GUI" -- that's literally what Movable Type excelled at. Especially versions 4 and 5, which had a FOSS edition. A number of major US media sites were powered by it for years. However because it was written in Perl, that became a huge negative point as Perl fell out of use in the industry.