More Toho Kaiju In The MonsterVerse?

XarKhaan,
No one is blaming the box office on them--The initial point is including them didn't do anything to attract general audiences who probably saw them no differently than an original creation. (Like the MUTO.)

And while we can blame its release date being put in the center of a Disney minefield, keep in mind it was WB that moved the film to that claustrophobic window from a much safer March release date. So they must've thought it was going to do better. (For some reason.) Reviews likely didn't help either as audiences tend to depend on that when there's an influx of blockbusters they're not sure which to spend money on.

@G. H. (Gman): Exactly. If general audiences see Toho monsters no differently than original monsters, is there really a point in licensing more of them in the future? This is why I keep arguing that purchasing Showa Era monsters like Gorosaurus, Manda, Baragon, and Kumonga would be pointless, as Legendary could just make their own similar looking monsters and have them fill the same role.