There is a deeper point conveyed in that sutta.
1. Maha Brahma is more powerful than any being below that domain. But that is the same a king is above all others in his domain. Both have finite lifetimes. In the next birth, they both can be reborn in lower realms.
2. Even a worm living today had been a Brahma, Deva, or a human in many previous lives.
3. Until attaining Nibbana, any living being WILL BE subjected to suffering in the four lowest realms in the future UNLESS at least the Sotapanna Anugami stage is attained.