Posts like this make no sense to me. It's like people somehow forget, (not implying you, Polioliolio), that outside of barely a handful of films--if even that-- the Godzilla franchise has been almost entirely escapist fantasy. For dozens and dozens of entries in the series, if nuclear weapons are mentioned at all, they're usually in the same silly context as in B-movies and superhero comics as a grab-bag source for a given monster's powers.
The franchise may have started as a somber meditation on the horrors of nuclear weapons, but that's very much been the exception to the rule. The direction Legendary is going is no different than what Toho themselves did as soon as the second-ever film in the series, and most of the rest thereafter. Shin Godzilla indeed channeled a lot of the same sentiments and themes as the original film, but given enough time, you can bet that the pendulum will swing back the other way to more lighthearted fare. It'd hardly be the first time.