I'm not sure that the "need" you're talking about is a practical one, though. Maybe it's an ideological "need", at best. More than enough people and websites seem to be getting by just fine without using Persona.
I think if there truly was a pressing need for Persona, we would have seen it get adopted rapidly and quickly. That's exactly what happened with Firefox. That's also what happened with Thunderbird, although to a lesser extent.
Openness is ideal, but it also requires some demand for that openness. Open systems that aren't adopted are really quite useless.
That's nonsense - for thousands of years human civilisations have got on quite well without democracy or human rights. If there was a pressing need for equality and educating the Romans used to say, it would have happened by now.
We can always take the wrong path, and find it hard or impossible to get back.
We may see an end to a single globally compatible internet in our working lives, we may see an end to strong encryption on devices not years old. Any legal action against these ends is surely something to celebrate?
I think if there truly was a pressing need for Persona, we would have seen it get adopted rapidly and quickly. That's exactly what happened with Firefox. That's also what happened with Thunderbird, although to a lesser extent.
Openness is ideal, but it also requires some demand for that openness. Open systems that aren't adopted are really quite useless.