Greatly depends on how much returns you want, on long term investing big in bitcoin is a good one, short term investing in some good altcoins will give definitely more profit.
We should even stop thinking about the returns but the value. Sure, everyone wants profit in the investment, but we should look at bitcoin beyond just the investment and see the value it brings and how we can tap into it. That is the easiest way it can help us in our decisions about buying at any price and reaping the benefits and holding as well without panicking when the price dips.
I believe bitcoin will definitely have values in million dollars then holding bitcoins as a long term investments is still a meaningful action. We cannot be sure about future but as per expert's speculations bitcoin may hit million dollar value too.
I could not agree more, and there is another problem associated with people that only get into bitcoin for it's price or for the profit it could bring, without actually considering the true value of the coin. If they don't think about it's true value, that should be the real reason for buying the coin and for supporting and as a consequence, making it's price rise, then they won't have any reason to hold or buy more it if the price falls, which would then result in a continued falling of the price. From this point of view, there would be no future for bitcoin.
Even on the best possible scenario, and from the point of view that the price is the real value of BTC and not it's applications and the possibilities it offers, there would still be no future for it. The price would stop increasing some day, so people would start selling, because from their perspective, BTC would have reached it's max value, so it would be time for them to cash out their profit (a typical bubble behavior).
We really need to try to "educate" people about bitcoin, so we can prevent this from happening.