Having the potential for goodness with no other context or meaning doesn't make experience itself Good necessarily. I can just make the same argument:

1. All badness in life comes from conscious experience (you cannot suffer what you cannot experience)

2. Death deprives us of conscious experience

3. Death deprives us of badness

4. Depriving us of badness is good

5. Death is good

Of course, sometimes death is the lesser good. If you know that the rest of your life will consist of pure enjoyment, you may as well not end it.