So is every other of the big 50's monsters: Vampires, Frankenstien, Wolfman, zombies, etc. etc. And for every Godzilla movie there's been well over a dozen vampire movies. It think giant lizards peaked with "Godzilla vs. the Smog Monster". The shark had been jumped.
My favorite: Godzilla vs Mothra. We need more Mothra!!! The bottom line is it’s a movie. Don’t analyze it too much. Have fun!