You need to know that when you kick the bucket in 10, 20, 30, 40, 50 years etc that the switch is actually going to work.
You need a company with the right moral compass; funding to pay for hosting, maintenance etc; and the longevity to keep going for the next 100 years.
Companies on the "maybe" list for me include Wikipedia, WordPress and maybe Evernote...
Internet Archive might be the best option if they can sustain their funding / longevity.