Monster Zero x SciFi Japan - Archive Only

They set up a sequel at the end of Gamera 3 with the flock of Gyaos, so why didn't they make a G4?

That wasn't a setup for a sequel. It was meant as the definitive ending of both the movie and the entire trilogy. The development of Gamera's relationship with humanity, the personal journeys that Asagi, Dr. Nagamine and Ayana went through and the overarching themes of the trilogy all culminate at the end of Gamera 3.

Wasn't there a Gamera 4 fan film made a while back? Would love to see this someday. I also heard that Daei was so impressed with the fan film that they even planned to screen it in theaters. But have no idea how true this was and if it ever happened.

I remember there was an interview with the director of Gamera 4 on ScifiJapan TV, but don't remember which episode. It was really cool and interesting, in the interview he showed off his kaiju models that he made himself.

It still gets occasional screenings, but it's not allowed to be distributed. Shinpei Hayashiya, the director is a famous performer in Japan, but is a big fan of tokusatsu. He also made Reigo and Raiga which are getting US releases shortly.

With the popularity of kaiju movies exploding these past few years, I’m still kinda surprised we never even got a sniff of a new Gamera movie. What might’ve been.

The trilogy feels so complete I wouldn't want anything added to it. It's fine the way it is.

... of course, another reboot of Gamera would be appreciated. Bring back the turt!

IMO no kaiju film made since the conclusion of this trilogy has come close to matching the quality of any of the three.

It's worth noting that Kaneko claims a fourth film would have been greenlighted had the third film grossed one billion yen. (Wikizilla, which cites Kiridoshi, Risaku. Tokusatsu Apocalypse 1995-2001.)