You guys never thought how would be the sentais in the future ?

Would it be seen as disrespectful should they have a Gorenger reunion and they re-cast Kiranger in a movie or Ninninger?

Depends I guess. It could be seen as disrespectful if its the same character. But they could still bring back the second Kiranger who replaced him for a while in the show.

Didn't the second Kiranger die in canon?

Damn forgot about that :lol

Another option could be to have him be a different character altogether.

Creating a new one altogether? That'd be an interesting path to take.

It would be. And with them being part of a military group and it already having happened once it would make sense.

Another replacement Kiranger would be interesting, having a guy be in his 20's along a team in their 50's :lol

The rumors about the next sentai start in september right ?

More like October, but those first rumors are never even close.