[Den-O]

If we're talking about the "likely" choices for Akiba Season 3 then just look at the first two.

Season 1
1. Dekaranger
2. Boukenger
3. Jetman

Season 2
1. Dairanger
2. Zyuranger
3. Hurricanger

Season 1 also had a live stage show to celebrate the season which featured an actual Episode 14. Appearing in it were:
1. Goseiger
2. Shinkenger
3. Go-Onger

Now going by the logic of the first two seasons we'll either have 2 post 2000 series with one pre, or vice versa. For the later Heisei stuff (2000+) plus the shows still on the table are; Timeranger, Gaoranger, Abaranger, Magiranger, Gekiranger, Go-Onger, Goseiger.

For the earlier stuff than that, I'd say they aren't likely to go pre-Jetman right now. That show marks a turning point in the franchise for both quality and design and is probably as far back as they'll reach to produce partial/full teams for now. Aside from special anniversary releases like Aka Ranger will most likely be. So for shows up to the year 2000 we have left Kakuranger, Ohranger, Carranger, Megaranger, Gingaman, GoGo V.

My personal hope for season 3, if it's only limited to 3 teams again and out of these available options would be; Gaoranger, Gekiranger, Carranger.