Just because most Bibles translate geenna “hell” doesn’t make it right. Hades,
for example, was once translated “hell” by the KJV but is now carried
over directly as “Hades” in most modern translations. Unfortunately,
most translations continue to render geenna “hell.” With the logic of that translation, though, hierosoluma could be translated “heaven.”

I didn’t claim the translation was "right."  I said that "hell" is what many Bible believers use today and it is also what the NIV renders—those are the empirical facts of the matter that I’m working with. 

As for your disagreement over the translation of the word "hell," I think that you should take that up with NIV publishers and translators.  I don’t speak Hebrew or Greek.  Do you?   

Jesus was talking about a place because Gehenna is
a place. Whether Jesus imagined the wicked being thrown into this
valley forty years later, in our future, or both, is what is up for
debate, in my opinion.

And your textual evidence to support that is….

Again, my concern is with the words of Jesus in the Gospels.  Show me some textual evidence that supports your interpretation of Jesus’ use of "hell."  Thus far, you have told me that you "disagree" with my interpretation, which is fine, but you’ve shown me little evidence to support your "opinion."