I mean it very literally took Apple refusing to support Flash to start its rapid decline.

Voting with your wallets has never really worked. Consumer preferences do change overtime but getting millions of people to act in unison is an exercise in futility. Until someone with actual market-swaying power brakes the wheel it will keep on spinning.

Like boycotts have and do work. I think the problem is average/majority user does not quite understand the minutia.

Successful boycotts seems to deal with worker mistreatment, racial discrimination and other unethical behavior that a business may be doing. Even then they are not always successful but it certainly is easier to explain the situation to people in those cases. However, still run into issues like it is too essential like food or just too much apathy for the entire market of that product.

Boycots, largely, do not work: https://freakonomics.com/podcast/do-boycotts-work-a-new-frea...