We almost lost Godzilla 3 times!
Toho, the Japanese studio responsible for bringing us Godzilla, has faced financial issues numerous times. This has caused them to create several "last Godzilla films ever" over the years.
1) Destroy All Monsters (1968) was made as a celebration of Toho's 20th monster film. They wanted it to close out the Godzilla franchise, so they included 11 monsters in the film. It was so popular, they kept the character going.
2) Terror of Mechagodzilla (1975) had the lowest attendance of any Godzilla film, so Toho put production of monster movies on hold.
3) Godzilla: Final Wars (2004) was meant to finally end the character. However, in 2016, Toho released Godzilla Resurgence.