For a big production company like Toei is around 9 Million $ grossing in total nothing much they are depending on. Especially when the production costs exceed the effort. They would earn more with a good motion picture movie any time and don´t even need to take in consideration what the fandom wants, which costs in making inquiries too.
Den-O, or Decade, is not Harry Potter or One Piece - with a fandom that´s existing a decade and won´t ever let you down on the booking office or gathers with each year even more fans. The average Kamen Rider Fan is staying for one season only and then plunge into a new fandom. That´s what happened to Den-O and it was foreseeable last year.
They might go for an memorial movie sometimes later, were I´m quite sure that it will not be a Den-O or Decade only movie, but right now at the current economic downturn would it be a breakneck to invest in something that´s so squishy like an finished and forgotten show.
But my main point was, that the fans who made Den-O popular are no longer supporting this series, because their reason to check out the show were their favourite Seiyuu and since they are doing new things the interest in Den-O sank extremely. But that´s nothing surprising.
Clinging on numbers like grossings or ratings let you see how many people actually saw something, but not if they really liked it and will support it forever. Also, the last Kamen Rider who had competition on TV and in the cinema was Kiva. Both Decade and W have rather nothing kids could switch to, because TV stations are saving on Anime and other kids shows right now. I highly doubt that they are really as popular as some fans are thinking, even when their movies and episodes let assume it by a good feedback in numbers. But is someone who is winning against a weaker opponent (or even nobody) really a winner or just the only left alternative?
