User blog comment:Kuopiofi/Saitama - Absolute or Supernatural?/@comment-25893909-20160906164927/@comment-24053170-20160908071044

Considering how stories constantly change over time via character evolution and the authors thoughts and ideas on how he wants the plot to go I wouldn't be so certain about that.

At some point ONE may in fact get bored with the story and likely end it by having saitama end up defeated.

You can't say for certain what will happen. After all, we didn't think Mashima would try killing off members of the fairy tail cast (true they managed to survive or come back, with the exception of future lucys version of fairy tail but the point stands that he did try to off them.)

You can only truly go so far with a seemingly invincible character before it becomes stale and repeative, so while the plot of the story may say that saitama is invincible for now, it doesn't mean that will always be that way.

Remember Mustavi, all good things must come to an end, even saitama's invincibility.

I am not saying it will happen now. but I am fairly certain that at some point in the manga he will change the focus of the plot.

A lot of authors do this, and i am certain ONE will end up doing so as well.

Well only time will tell....