I think that there is a natural proclivity for institutions to quickly become about their own survival and growth. They always go too far, because they don't do enough, and then all celebrate and disband. They keep on their track until they are forcibly derailed. — All sight
What you say here may be true, but we could provide some concrete examples of this process happening.
We create "institutions" like Congress, United Way, the Church (whatever denomination), the Metropolitan Sewer Board, Universities, General Electric, libraries, etc. with the intent that they will and should perpetuate themselves. Persistent institutions are one of the ways we maintain continuity in culture (for better and for worse).
Here's an example: MN AIDS Project was founded in 1983 to somehow deal with the then-new disease among gay men. It grew rapidly, did very good work, had successes and failures like most organizations. By 2003 it was no longer very connected to the gay male community (which had itself changed over the years), it had found stable funding, it was thoroughly professionalized, (no longer fueled by volunteers). It was "an institution". It began looking for new problems to deal with, to continue its existence, rather than just admitting that it had done what it could and would throw in the towel. AIDS and HIV haven't disappeared, of course, but the problem of 2018 requires a newly founded group to deal with the much different circumstances (like HIV now being more common in young black men than in gay white men).
Many organizations have followed the same path. They begin with an urgent problem and committed people, work on that problem for a while, reach a stage of routinization, become entrenched, and go about surviving because they exist.
I've proposed that non-profits should come with a sundown clause: After 25 years, they come to an end, disband, liquidate, and disappear. New non-profits tend to do their best work during the first 10 years.*** IF the problem that the nonprofit originally addressed is still around (it often will be) then it is time for new people to start a fresh project to address that problem--for a limited period of time.
On the other hand, institutions like the Carnegie Foundation, Ford Foundation, Rockefeller Foundation et al, set themselves up to exist for a long time, for better or for worse, and tend to stick with their initial goals (which might or might not be good).
***No proof, of course. This is just my impression after working in nonprofits for 40 years.