As time passes by more people will start using bitcoin in one form or the other be it investing in new projects or for gambling. I do not know what is meant by bitcoin will be used by almost everyone but it is not that easy to say that now and if that is to happen to fiat has to disappear which is not a possibility .
For the bitcoin, you can invest quite easily in some cloud mining places. But that is quite dificult to find a good one.
Cloud mining is almost never works out, if you want to invest in bitcoin, buy it, dont' "invest" in cloud mining.
I agree, rather than buying hashes, it is much cheaper to buy bitcoin directly. It has been proven that cloudmining is not profitable at this time. Those who invested in cloudmining in the previous year never got their investment back when these cloudmining company shutdown.