The problem is that I reject your notion which states the state of death is eternal while life is ephemeral, but this is fluther so I’ll play along. Let’s just suppose for the sake of this question that this life is the end, and that death is final then I would say that this realization is irrelevant to me for the following reasons.
If death is the end then a nonsentient entity can’t be deprived of something (such as pleasure or love) which they’re not sentient enough to be aware of the concept of missing out on something pleasurable or not having a loved one around anymore. Also, missing out on pain is almost always a plus so that would be another plus for oblivion in my eyes.
Personally I’d be more concerned about a future of which I’d still exist (or continue my sentience after physical life), and an existence of which I’d have my faculties to be aware that I’m being depraved of something pleasurable. It’s not the possibility of oblivion that changes my outlook on life, but the thought of a potential future personal ‘hell’ that does.