I will stop advocating a particular PBS/MPS implementation when independent evidence shows that it does not improve decisions, bargaining, licensing, attribution, or dispute resolution enough to justify its cost and risk.
I will also stop when a simpler institution solves the same problem more safely and effectively. The objective is not to preserve PBS/MPS as a brand or technology. The objective is to prevent economically material contribution history from disappearing before society can judge its significance.
If that objective can be met without tokens, without blockchain, without a new security, or without PBS/MPS, that is a successful outcome.
The broader work ends when contribution evidence has a credible institutional home, or when rigorous testing establishes that such a home would do more harm than good.