The legal system dealt with this hundreds of years ago. We cannot have "dead hands" dictating how future generations should live and work. The proper vehicle for such things is government. Donate the land as a park or nature preserve and cross your fingers that your intent will be respected.
https://en.wikipedia.org/wiki/Rule_against_perpetuities
A similar worry developed around the concept of compound interest. Some semi-rich people wanted to park money in bank accounts for a few generations in order to make thier great-grandkids into powerful people... with explicit instructions on how to use that money/power. Such multi-generation shenanigans are against the general public interest.
The whole world is dictated by dead hands. I cannot walk around pristine forests (maybe I even need to pre-register), I need to deal with bureaucracy, I need to pay taxes, almost every single landscape is ruined by human buildings, etc. So what is that even about?
Not all art is to everyone's taste, and that's ok too. You don't have to enjoy this art piece. I find the idea of creating something that I cannot possibly enjoy to be quite poignant. But hey, I'm sure you have art you enjoy that I do not.
remind me in 88 years.
Also, file in “things that will never happen.”
Trees get turned into paper every day, I'm sure there's a paper mill willing to take the work, especially in Northern Europe.
So, instead of some future people celebrating this project, they just think "Ew, what kind of monster would wish harm on a beautiful old tree?"