Sentai Forever Red

[Kamen Rider IXA]

Do you think it's possible to make all Red Sentai Rangers transform and do a roll call together? Would you like to see it?
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[MattEmily]

Yes it's very much possible but it would cost a lot of money by Toei in order to accomplish such a feat considering they're about to have 39 Sentai starting next year.

The only concern is whether the respective actors are still alive or not.
Goranger's Akaranger recently appeared during Gokaiger so he's still alive.
JAKQ
Battle Fever J
Denjiman
Takayuki, he was the second Red one. (Sun Vulcan)
Goggle V
Dynaman
Bioman
Changeman
Flashman
Liveman
Turboranger
Fiveman
Jetman
Geki (Zyuranger)
Ryou (Dairanger)
Goro (Ohranger)
Kyosuke (Carranger's Red Racer) recently appeared during Gokaiger so he's still alive.
Kenta (Megaranger)
Ryoma (Gingaman's Ginga Red) appeared during Gokaiger.
Kakeru (Gaoranger's GaoRed) recently appeared during Gokaiger so he's still alive.
Hurricanger's Yousuke.
Dekaranger's Ban (DekaRed) recently appeared during Gokaiger.
Magiranger's Kai (MagiRed) recently appeared during Gokaiger.
Satoru (Boukenger's Bouken Red) appeared during Gokaiger.
Gekiranger's Jan (Geki Red) also appeared during Gokaiger.
Sosuke (Go-Onger)
Alata (Goseiger)
Karou (Shinkenger's female Red) also appeared during Gokaiger.

The ones that have character names by them are ones that are known to still be alive.

[PRangerX]

Would be cool. But dont think we will see it. Sentai has had a few reunion specials of its own. So we will probably get more stuff like that for anniversary years.