> Now, it merely requires a legislative ultra-majority - improbable but more realistic than another public vote.

Public initiatives are far more easy to pass than legislative ultra majorities, which is why they are often used to bypass requirements for mere supermajorities in the legislature in CA.

It's true that the 7/8 out doesn't make it harder to pass change since it can still be overturned by vote of the people, but it doesn't make it meaningfully easier, either, since such an ultramajority is much harder to marshal than a simple popular majority.