I would be skeptical, but open, so long as it is frequently renegotiated. Dev salaries have gone up incredibly over time, and new technologies come in all the t

I would be skeptical, but open, so long as it is frequently renegotiated. Dev salaries have gone up incredibly over time, and new technologies come in all the time. After new technologies/niches come in, their value changes over time. A specialist in neural networks pre-2010 vs post-2012 would have quite different market rates. It wouldn't be enough that most of us on average are better off today. It would be important that most of us on average will be better off today and in 15 years, which seems to require frequent renegotiation in a fast moving sector like this.