Megaranger had some awesome mecha. But the show itself was not a space-themed show, so I think there is still room to do a 100% space show.

I think it would be great to see a 100% Space Sentai.

Military sentai much like Ohranger and Goranger would also be cool. Celebrating 40 years of Sentai and a good throwback to the 80's sentai.

Well, the 40th anniversary is less than a year away now, so anything's possible.

they probably aren't gonna do a military Sentai.
Toei seems like they don't wanna take the risk.

Dinosaurs

Dinosaur cars.

Space Dinosaurs!!

Mechanized dinosaurs

Already been done.....All 3 times Vega. :lolol