Considering that the numbers have more or less stayed equivalent between MTMTE and RID, I think it's reasonable to assume that most people brought into the comics from MTMTE, or anything from Phase 2 (but let's be real, that was the one getting any kind of attention outside of the TF fandom, even if it wasn't a ton), at least tried the sister titles. Most anyone who asked where to start here would be told to basically start at MTMTE vol. 1, and alternate back and forth until the crossovers. Also, none of these other franchises have had cartoons on TV without around year or so of interruption since 1996, no have they had a successful (financially) film franchise. There is absolutely no comparing Transformers to any of Hasbro's other dead franchises. It will never be the same level of obscurity of these other ones. Even if it falls out of the public eye, the fandom is still quite strong. Like, what other multimedia has such a tremendous amount of unofficial product that TF does?