I don't see any reasons for them not to release an album each year.
They aren't mad famous so no nation-wide touring, their VK years are pretty much over, so there's no need to release 20 + singles in 3 types between each album, and a 10 track album once in 12 months is not much since 3-4 of those already come from singles.
Gzeatte technically roll out more songs per year than any other band, yet I don't see anyone calling them out.