I believe that we can ALL collect 3 bitcoins in our life time. I am not saying that it would be easy, right now 3 bitcoins would worth 90 thousand dollars and I think it will keep going higher and higher so it is not going to be easy at all.
However, if you could save some money every month, then you are going to get there eventually and the important thing is not about getting to 3 bitcoins, it is about getting to a higher and higher level all the time, and if you keep having more and more bitcoin, then one day you will be rich. So, let's assume you failed, and you only got 0.8 bitcoins but bitcoin worths 100k, that means you have 80k, which is close to having 3 bitcoin today. That is why we should always be looking for it.
For many on our planet, this amount will be almost unattainable, some cannot even save more than $50 a month, this is about $600 a year and it is not difficult to calculate that in 30 years you will collect no more than $20k.
During this time, bitcoin will certainly rise in price and each of us will be able to buy less and less satoshi. Therefore, I think that for many, the goal of 1 bitcoin may be unattainable, let alone 3 or more bitcoins. Of course, it is worth buying, it will bring profit, but if the investment is not significant, then you should not build illusions that this can make you rich in the future.