Yes, it is possible.
Bitcoin should become mainstream.
It means that we need much more users and many more merchants accepting BTC.
But, there is no easy way to achieve millions of dollars and it's not realistic in short period of time.
Possible but seriously unlikely, even if it goes mainstream that does not give us a million dollar tag does it, at the moment there is no need for bitcoin if there is finally a need for it then we will reach thousands i am sure but million lol
This is the confusing part:
Q: Why should I use bitcoin?
A: Because it can make you some money
Q: How come?
A: 2 steps
1. Buy some bitcoin and store them
2. Let all your monthly consumption go through bitcoin (purchase bitcoin and spend them), then your stored coins will become more valuable and you will get good profit when you sell them
And I don't think it is a pyramid or Ponzi scheme, since the process does not involve anyone else, only your own action: You first invest in some bitcoins and then let your consumption pass through bitcoin to reduce the amount of coins on market. The second action will give the coin value a permanent lift so that when you sell your invested bitcoins, you will always get a good return
If only one people do this, the result might be neglectable, but if every one is doing this, the result will be significant
Of course you can only do this once, when you already have all your consumptions pass through bitcoin, unless you further increase your spending, there is no more support that you can give it. In fact, when your coins worth more, you might have some more spending directly from your stored coins, that might reduce the value of bitcoin