Lol I've seen a few of the hanging tomato sack grows and they're pretty amusing! They seem to always right themselves anyway, at least under the sun or light source and there are issues with runoff nutrient water on/in the buds if your not careful. Might do really well with some of the more lanky, viney strains.
I would love to see it perfected though, seems you could add a ceiling section to any vertical scrog setup and with the light source below the bag they might grow pretty normally...?