I've followed the topic a bit. I bought bitcoin when it was at 100$, unfortunately I sold it when it was only at 200$...
The blockchain is a really interesting concept, but there are a bunch of things that really bother me a lot (my opinions only):
* the amount of energy wasted in computing is *staggering*. The technology is definitely something that we could use when solar energy is cheap or even free, right now it's a huge waste.
* nothing is regulated, and I have very few doubts that if these things go mainstream they will be.
* right now, it's only *speculation*: there is no fundamental whatsoever. People buy, people sell, people just want to make money. I had 200$ invested in ETH untile last week, bought LTC, see what comes next. It's just a gambling for nerds, atm.
* Chinese have majority of Bitcoin, the politics of the "currency" are decided by a dozen of people. This is very risky.
* Ethereum is more promising, but it's really complex to understand technicalities and the different nuances between the dozens of alt-coins out there.
All in all, I just think that right now is nothing more than a "gamble". Technology might be promising, but when people actually gain 100000% in few years you know that FOMO and speculation will be all over the place. Right now, I just don't understand anything more. Will see when things get a little bit more concrete. My advice: play with money you are willing to lose in the next 10 minutes. It could definitely happen.