Considering the amount and the relevance of Bandai licences, they could cover every theme:
- Space: Gundam
- Super Heroes: Dragon Ball
- Ninja: Naruto
- Pirates: One Piece (if there aren't issues with Nanoblock's rights)
- City: a random IP including Tokyo's famous attractions
In relation to Bandai's resources and years of experience in selling Gunpla and high quality toys such as the Chogokin line, if they had a serious intention of getting into the business of interlocking plastic bricks, they could be the company able to break the monopoly.
In every market a true competition is always welcome.