According to the story it's still available in California as an option for paying your state taxes, it's simply never became the default/only option. If you're in California and want to go find it and use it, it seems you can.

It was popular among people who got to try the pilot program. That doesn't necessarily mean it would be popular among the general public, especially opponents campaigning heavily against it.

It doesn't necessarily mean that, but it's the strongest evidence I could possibly imagine that it would.

It's strong evidence, yes. And I certainly support the change. I'm just saying I don't think it would be a given just because the pilot program was popular among participants. People vote against their interests all the time when campaigned in the right way.

Edit: Also I noticed my previous comment was missing a word. Should have been, "Especially with opponents campaigning heavily against it."