Unfortunately I would think very few would care. For example, the Green party is very progressive, and comes with a TON of advantages electorally. They’re on the ballot in almost every state, run in local and national elections, and have a system all set up for nominating people, etc. When you look at the Green party’s platform, it’s very close to what the progressives claim to actually want. Yet most democrats just shit on them at every opportunity instead of voting for the platform they ostensibly believe in.
While I personally do like Stein, I agree that others would be better. Stein didn’t even want to run, but the Green Party loses all the electoral benefits I mentioned if they DON’T run. Stein basically recruited Cornell West to run for the Green Party nomination, and there was a time when it looked like he would be the nominee. However, he dropped out because he didn’t want to do the campaigning work within the party to become the nominee. If he had actually been serious about running, he could have clinched it and I think would have gotten a ton more traction. From what I’ve heard, it seemed like he was scared to gain too much traction and potentially be a real spoiler. When he left the Green Party, someone had to run to preserve their electoral benefits, so Stein stepped in.