Everybody is free to buy Bitcoin. Maybe your religion or government is not allowing it, but you could still get some and this will never change. The day that Bitcoin has anything to say as to who can use it, is the day Bitcoin dies. Bitcoin might not be the solution to every problem, but it is a huge improvement over what we have now. All the information you need is out there, so if somebody doesn't use Bitcoin it's their own fault.
But it's a fact that the elite will definitely have the greater prowess to buy more bitcoins down with their fiat. How can the poor compete with them if they have unequal spending capabilities. It's still going to follow from the conventional fiat system if we don't bridge the gap.
Like i said Bitcoin will not solve all problems, but with Bitcoin you get some advantages. The wealthy elite can't just print more money. Nobody can freeze my account. The Bitcoins are somewhat traceable, what can help against corruption. etc.
Another thing is that we can't just give up because they will win anyway, so why bother and even try. Well that attitude leads to nowhere, and if this is what people think, than it's no wonder the rich tell us that we want this.