I agree with island mans thoughts.
If if you look this up with the NASB bible it becomes much more clear what is happening. In the context leading up to this verse he's talking about the procedure prior to Christ put in place by the Mosaic Law. The Israelites never achieved real forgiveness because they had to continuously make offerings. Then he COMPARES the way men die once for all time to the way Christ died once for all men, showing that this was a perfect atonement and demonstrating that Christ doesn't have to die over and over again.
But this doesn't mean there won't be some who survive the end and never have to die. Pull up an NASB and read the whole chapter a couple times and this will appear much more clear.
if you doubt this is the case though, I'd take the thought you're getting from this and compare it to the expressions found elsewhere in the scriptures. check how it harmonizes with the entire bible as the context. Paul expresses this same sentiment elsewhere, which is why I feel comfortable asserting the meaning. But I'll definitely be looking into this myself and if I find anything suggesting I'm wrong I'll be sure to post it.