First off, I'm pretty sure the Showa and Heisei eras qualify as cinematic universes, Toho. But hey, more Japanese Godzilla, I'm all for that.
And secondly, in regards to Shin Godzilla not getting a sequel...I'm honestly not upset. No, sincerely, I'm not. Might be surprising when one considers how much of a vocal fan I am of the film, but it's true. I consider Shin Godzilla a masterpiece and I genuinely feel a sequel not being written and (co-)directed by Hideaki Anno has serious risks of being an unsatisfying if not outright terrible continuation.
Either way, I'm a happy man and I'm looking forward to seeing a new era of Godzilla.