What makes you say that SN will replace N in the coming years?
The only downside to N is acquiring it but past that, N is undoubtedly the best method because its super simple (just drink) and the only discomfort you will experience is the taste. You won't even feel yourself falling asleep, you'll just be gone
The concern about failing with N and the "permanent damage" is irrational in my opinion. This study shows that it is possible to survive N without brain damage
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6314932/
Another study ends with "The patient recovered without any neurological sequelae." IE: No brain damage.
https://www.proquest.com/openview/fd33f2acd839f7a83fa2080ab82b596a/1?pq-origsite=gscholar&cbl=226517
Hell, we have our own poster on this forum who gave a very long post about failing with N. You cannot do that with brain damage...
The reason you able able to read about "failed" cases of N ingestion is because of the rarity of such an event. The probability of surviving N is low unless you get early medical intervention. The vast majority of people drinking N will be free from this world within ~1 to 2 hours assuming you ingest the correct amount of N and haven't developed a strong resistance to the barbituates.
More than 24 hours is pointless but if it gives you mental comfort then go for it. Just don't sell it as a "must do" because its not.