Bandai would release another batch if demand is strong enough. So try emailing sellers (HLJ, Amiami, Anime Export, HK Collectibles etc) and ask if they are expecting more. That way Bandai's reps are more likely to be informed of demand.
It also takes a while to purchase materials, book a factory and train workers to mass produce high-grade toys. It looks like Bandai are currently focusing on the new batches of VF-25s.
The YF-29 is rather badly flawed tho. They may not want to revisit it.