[Kamen Rider Lucha]

Bandai of Japan releases product on a predictable yearly pattern, and that pattern works very well for them. Having a weekly TV series running alongside their annual release schedule--one that works as a constantly updating ad campaign--is a key part of that pattern.

A shortened series isn't going to happen unless Bandai has decided to completely overhaul their release structure. Which, to me, seems unlikely considering the incredible success of their current model.

Decade was the last shortened series. Why? Well, one logical reason is that BoJ wanted to start releasing new Kamen Rider and Super Sentai product lines 6 months apart from each other, to avoid one product line cannibalizing sales of the other. (Note that Decade is the last Rider series to premiere with a Sentai series in Q1--subsequent Rider series have premiered in Q3.)

If we get a shortened Gaim, expect a new toy release paradigm from BoJ. Though, I doubt we'll see a significantly shortened series because BoJ is reporting record sales under the current paradigm.