It would help the forum to keep going! Would it not?
I don't really think it would. While it would be nice for this forum to live for a long time, I doubt anyone will care about an online number of points and title to stay here for several decades.
People would donate if they have worked for 10 or 20 years on making their account with 5000-7000 activity.
Would they? I don't think it would really make someone donate over $3k (right now) because they have been here for a long time.
Not to mention the fact that people have better activities to do.