Hare aims to become a 100-year programming language
harelang.org
harelang.org
Besides, we truly need some revolution in system languages, I believe. ATS, F/Low and Rust are really good first tries, but we are not there yet in terms of soundness/completeness optimum. So it will take time and many attempts to develop some truly safe and simple language with resource tracking, generalized compile time computations (i.e. effect/totality tracking and dependent types) and so on.
This quote could really use a secondary blog post outlining why they believe this is true relative to other languages. Putting aside where it stands on a relative basis, there are several decisions that they make that I personally think are directly in opposition to the absolute goal of robust program design. One specific example is that Hare supports global variables which is pretty hard for me to accept in a greenfield language.
If they want to last 100 years, I would suggest that they go far smaller than they have. It is clear that they could self-host the Hare compiler with a much smaller subset of features than are in the language spec. That smaller Hare would be much closer to the true essence of Hare and would make it much more likely that they would create something capable of enduring for 100 years. It's a great goal but I think they have a lot of work to do if they have hope of achieving it.
The goal of my language[1] is also to be unchanging after the 1.0 version. However the language is extensible in many ways therefore not hindering the ability to evolve while still getting the benefits of the super stable base that you can build everything on.