You would be able to get your hands on a electronic device if there was a societal collapse. If we are talking about a natural disaster which causes a societal collapse like a solar flare which wipes out most of the electronic devices on earth there will still be laptops and computers which function because they would have had protection against that in a faraday cage. Then eventually society would start building electronic devices again. You do not need a hardware wallet you just need a computer and because of how the internet works even if the country you live in bans Bitcoin you can still download that wallet software and take your money out. I am certain that a country cannot ban a currency over night and instead have to allow a grace period for their citizens to take their money out of Bitcoin and back into fiat.