Hong Kong TRU have been testing out the "pop up store" model for a while, normally in conjunction with big displays for various franchises (including Transformers) as that tends to be the only way people there will make the effort to go to the obsure malls they tend to choose. It seems to have mixed success but doesn't do anywhere as well as their larger permanent stores.
ToysRUs Asia also have ToysRUsExpress which would be the "mini" store Ralph might have seen in Singapore.

I think the pop up store model might work here, however stock variety will be limited due to space/portability & storage. They might have to do some analytics on suburbs to figure out what toys will sell best in areas they decide to set up in if they truly want to target this as a successful model. A fixed store gives them a stronger foundation on which to no only offer a wider range of product but also run a "click and collect" model should they wish. It will be interesting to see how it pans out and evolves and whether it can reclaim the dominance the name once had with new owners.