I disagree with you in one part:

You have to see that a quite high percentage of the users who ever used a Jolla like Sailfish OS. You can't count users which never used Sailfish OS. And you can't count people who have never heard of Jolla - People which just go in the next shop and buy what the the shop assistant tell them is the best for their needs.

There are by the way a lot of my friends who tried it. All of them liked it, but none of them bought a Jolla phone. Why? Well there are multiple reasons. Most of them asked just for the specs of the phone and were disappointed. They agreed that my phone runs pretty smooth (and even better than some of theirs), but nevertheless there was the longing for higher specs and a better resolution (some of them already need reading glasses and wouldn't have recognized any difference between a full HD display and the Jolla screen). And then there are the people who just buy what all their friends buy. And unfortunately I am not one of their ideals, I'm the crazy guy without facebook and whatsapp....

So looking at my friends, Jolla should have offered a high end device. Because most of them just want to show off with their mobiles. (Not very nice friends in this respect )

On the other hand if they would have sold their High-end device for 900 € there would have been many people which simply couldn't afford it.

I agree with you that the most people out there act like you discribed:

if they had in the past always an Android Phone and weren't really disappointed they will again buy Android phone's in the future. It doesn't really matter if there is a better system.

But when you don't see any chance to break through this pattern, than any other OS is doomed and we have to accept, that Android is the Windows in the mobile world.

Anyway I for myself think their is a chance. But you need a huge power of endurance. This isn't something which you can reach in a short run.