That is very hard to predict. You can never know what is going to happen with Bitcoin in the future and that is the problem.
Of course we all hope that the price will rise for a long time so we can get some more profit later in the future and that will be good.
Yeah, totally depends on the value of bitcoin in future, if the price is good you can surely become a millionaire and if the price drops down then you need to have more btc in your wallet to be a millionaire.
i think the best times to be a millionaire were when bitcoin was still worth below $50 per coin. nowadays it's difficult to collect enough coins to make you a millionaire at some point in the future, unless the price goes up to $10,000 and higher. but then again, you will need to buy plenty of coins at current prices.