Not all really need Bitcoin TBH. Some are enough already with using Cash/Fiat right now and some don't have the time really to know what is crypto or Bitcoin in specific.

I don't think that generalizing is good saying that the world doesn't need it because still there are some people who needs Bitcoin in any ways. Yes Bitcoin has been used to hide something like in dark net and there we can see that some really need it to hide themselves.

Right now maybe there are only few who are using the real function of it but give it some time . More and more will use it