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If someone is using an SSD for long-term storage, they are spending too much money... Capacitors and Batteries discharge over time, no voltage, no data. The idea of an SSD isn't even about storage, but performance. If both are required, hybrid is the way to go.
I'm not going to replace one with the other, they both have their function. Maybe in a decade when SSD have proven their worth in terms of reliability, but currently, few people are going to want to put valuable data on an SSD.
What kind of reliability are you expecting out of a SSD? You expect them to last 10 or 20 years? If that's what you're looking for, then that is reasonable and it is what SSDs are achieving now with write endurance. As with any electronics, including hard drives, there is always a chance of early failure. Here's an article which shows that hard drives have a median life-span of about 6 years:https://www.backblaze.com/blog/how-long-do-disk-drives-last/ I was not able to find life-span testing of SSDs. The best I could find was testing which pushed SSDs to their write-endurance limit, then converted their constant-writes to a life-span based on writing a set amount per day.http://us.hardware.info/reviews/4178/10/hardwareinfo-tests-lifespan-of-samsung-ssd-840-250gb-tlc-ssd-updated-with-final-conclusion-final-update-20-6-2013 Writing 30GiB per day, the SSD would theoretically last 23 years before showing any signs of wear, and 29 years before failing due to wearing out the memory. If that's not reliable enough for you, then hard drives definitely aren't reliable enough for you.
This is all true, but there is one problem with your premise: write endurance isn't the only thing that will break an SSD. In fact, it's probably among the least likely causes of failure in an SSD.