Fiveman.
1. Hate it or love it, 1990 was the year of Winspector in both ratings and sales.
2. The show is considered very formulaic or as the cool kids said it a few years back basic despite trying to be different making them siblings and school teachers.
3. Toys, specifically the robots, were pretty much improvements/rehash of Turboranger robots(though I would like to comment that Super Five Robo looks better than Super Turbo Robo proportion-wise).

I remember reading a few years ago that Goggle V was really unpopular in Japan. More recently, I'm pretty sure Toei would love to burn every scrap of evidence that Go-Busters ever existed.

I wouldn't be surprised if Ninninger became the new Go-Busters. Not only did Ninninger sell worse, it was one of the worst selling shows in the entire franchise. If only I could remember which show sold worse. Ninninger, Gekiranger, or Timeranger.

Geki had a huge following in Korea. Toy sales and ratings were ABSURD. Wonder how well the eventual Shout Factory DVDs of Geki and Time will sell though

Really ? looks like the franchise was almost cancelled.

I doubt they would cancel a franchise that's been printing money for 40+ years over a single flop. Especially since the flop in question came after a Sentai that was extremely successful.

I know it's too early to talk about that but, could the 2020's be the last sentai ?

I doubt it. Kyuranger's been VERY successful despite an all time low for ratings

Toys for shows aim at young boys will keep things going even if the show has low ratings. The same goes for anime aim at young boys too (Dragon Ball Super is making a lot of money from merchandise sales).

Should we have another mini sentai like Akibaranger ?