DS Daily: No More Guitar Heroes?

The ESRB spilled the beans on yet another version of Guitar Hero: On Tour for DS, this time including "modern hits" like "Paralyzer." We could debate the worth of the annual updates of the main Guitar Hero series, but we thought we would focus on the DS version for this topic.

There are a few differences between the main GH and the portable series that could affect the worthiness of the (even more frequently than) annual releases: on the one hand, there's no DLC to extend the DS games, and on the other hand, there are (probably) no new instrument controllers to add to the experience. Putting aside for a moment the question of whether Guitar Hero should ever be on the DS, should there be multiples? So often?