DNG downsizing?

At the Photoshop virtual summit, in a presentation on noise removal there was a tongue-in-cheek suggestion that you might purchase a different camera with lower pixel density. Most new cameras do have sensors with more pixel sights than are generally needed and fewer pixels would eliminate much of the noise. But you really don't need a new camera because PS will allow you to export to a file with fewer pixels and that will have much the same effect. At the same time, fewer pixels will process faster and require less storage space. You do limit options if you need to crop the image for example; there are trade-offs. But there are some operations in PS that are available only for RAW files.

This raises the question of whether DNG files could be exported with reduced pixel counts, maybe with only a few choices such as 1/4 and 1/16? It seems like this would be fairly easy to do and could sometimes be useful.