Fads come and go in the markets like anything else. The real question is the long term staying power and it's ability to hold up against federal reserves in all countries that hold the purse strings with iron fists.
To me bitcoin is a fantastic speculation that can yield tons of cash, but it's legitimate long term viability is very much in question still.
For those new to the game of speculation and finance, you can read stories from all decades about hot trending markets that boom and bust. Many decades and generations have had their own +100% returns for individuals. In these times it makes people think they are investing gods. Until markets change and then they realize there is more to the story than riding trends and hot tips. Only a few people make it out of these cycles and stay in the game long term.
As a professional with a business, I just want to caution people to treat this seriously. If you aren't treating this like a business then you should work towards some education. A few million in any market is great until it get's wiped out and you don't know why. In addition there are many professionals that are getting and are in the BTC markets. These are the people that will be the first to get out when rainy days come and they will.
This is similar to the S&P, where the average person doesn't understand business cycles and the feds part in it. The market dips, professionals get out and are ready to buy back at the bottom, while many and most were subject to highly leveraged losses.
Just want everyone to be financially safe is all. Not being anti BTC at all. I have been around long enough to know how markets work and you see the same trends over the years.