Maybe you think that should be the first mission of every organization, but it clearly isn't. After all, if you gave me $2M and I was supposed to use it to set up an organization that survives for as long as possible, it is likely that I could easily set up a legal entity in the United States that has a recognizable successor 300 years later (and no expenses or employees). If administrative costs are as high as $5K per year, with zero interest, that is still 400 years. But lots of organizations have more than $2M as some point, but at a later point just a couple of years later go bankrupt and simply disappear. Clearly it is not the first mission of every organization to live longer.