That's what I think the word die should mean.
The only scenario I can think of outside of end of the world scenarios is if a huge bitcoin crash of 95% or more leads to a similar amount of mining systems coming offline due to no longer being profitable enough to pay for even electricity in cheap electricity areas. This would cause confirmation times to skyrocket and unconfirmed transactions would increase more than it is now. What would follow is a panic where everyone is selling and eventually the price could get so low the mining difficulty will more or less never adjust and everyone quits bitcoin.
That's the only realistic scenario I can think of but there are many flaws to it too such as people that mine for altruistic reasons, people who don't pay for electricity etc, so it should always be possible to fix these issues within a reasonable timeframe.
Then smart people would start buying all of it up for cheap and start mining. Bitcoin will never end.