I believe that bitcoin still provides a lot of utility, fairness, improvements and disruption, even if it ends UP being used by mostly richer people... not that I am advocating for such a world because I do believe that there are going to continue to develop second and third layer solutions that still empower less wealthy people.. and especially if such less wealthy people are escaping a country with all of their wealth (let's say that they have $100k or even smaller amounts such as $10k), they may well be better to escape with bitcoin in their heads rather than having gold stuffed up their nether regions.
People in certain 3rd world countries earn 1 USD per day and have to pay for housing and food with that. I am not entierly shure how those people then can pay for their food and housing if a single transaction would cost 1.000 USD. And for such a person it would also be not an option to just wait for the next bear market to be able to buy a piece of bread.
Everyone likely benefits from having a more fair monetary system, even if some people might not be able to afford to buy bitcoin in the beginning or to save in it... but the more and more that bitcoin might start to infiltrate all areas of life, then perhaps even really poor people in the $1 per day category might also be using bitcoin on second or third layers and maybe not even knowing it.
We do not necessarily need to take the most extreme examples of people who might not be able to invest because it might be more difficult to show ways that they might be advantaged from bitcoin, and I think we are deviating a bit too much from this thread to be fleshing out those kinds of speculations (even though I stand by my speculations, even if they might not be fleshed out very well).
Regarding savings and/or investing, of course, no one is in a position to save and/or invest unless his income is higher than his expenses, so he has to have a certain amount of discretionary/disposable income before he is even able to invest, and so there are poor people who never are able to own anything but there are also poor people who might be able to scrounge together wealth or property, even if it might take 10s of years and even be spread over generations of wealth building, and maybe all that they have to their name is $10k or $100k, and in my earlier example, even if they are fleeing to another country they still could be advantaged by putting their value into bitcoin for the purpose of transfer that value to their destination country versus other ways that might not be as practical, such as my earlier gold example.