If we knew the answer to this question, then everyone would sell all their property and invest in that currency. But we can not look into the future, therefore the opinion of experts remains only an opinion, but not a prediction. In any case, if you decide to invest, in no case do not put all the money on the card 
I agree on your idea but we can choose wher to invest is the one that we can see the potential that near in the future we can successful on it.
Bitcoin now has the cheaper value that in the market, if we can recall bitcoin has one of the high price, it is in demand that the supply is very limited but now it is on its opposite scenario.
But still i would like to choose bitcoin to invest because i think that day by day investors will come to invest and other investors will hold to make the price rise again.