Why not ?

You do realize you are gonna get deleted like the first draft doc file of a school essay if you get infected or lose at a fight though right? :lolol
Just sayin.

Ex-aid was military too ?

What? No. Unless you want to count the FPS genre being a design motive for Snipe

The showa riders was somekind of hybrid between mutant/cyborg ?

Cyborg=mechanically enhanced human, so yeah

What if we has Kamen Rider Series as big anniversary in the future just like Gokaiger from Super Sentai? It will be really interesting too if some episode are tributes to past Rider series and previous Rider actors appeared in tribute episode.

At one point I’d have said it would be too hard to get the previous actors back, but Toei has done a good job of getting people to come back over the last few years. There would probably still be some actors like Joe Odagiri, Takeru Satoh, or Hiroshi Mizushima that wouldn’t want to come back, but I think an anniversary show like that could probably get a decent amount of veteran Riders at this point.

It wouldn't necessarily have to be the lead riders, seeing as we got Ibuki and Zanki in Decade portrayed by their respective actors and even Ixa's actor showed up in the Wizard and Gaim movie. In the case of Den-O, I could see Takuya Mizoguchi taking over the role.

The only one that could pose a problem is Stronger, since all the protagonist actors are no longer with us.

Would anyone like to see a American Kamen Rider comic book series? They could do their own original American Kamen Rider if IDW or Boom Studios gets the rights to it.