Whether one should invest in bitcoin or not depends on whether you think Bitcoin will become a long-term trusted store of value.
If it does become a long-term trusted store of value, BTC should trade around $2,000,000 a coin (depending on how many coins are lost and are actually in circulation). That is over 100x the price of where BTC is today.
If BTC does not become a long-term trusted store of value, its likely price will be close to zero (unless it becomes a "cool" collectible... which is a possibility).
So if you think BTC has a 10% chance of becoming a long-term trusted store of value, it is a good investment with a nice expected return. It is still very risky but professional investors should invest some small portion of their portfolio in this case.
Yes. I do believe that bitcoin has the right potential and capabilities of becoming a long term trusted store of value because since the bitcoin has started its popularity among the people have increased a lot all over the world. Because of which its users have also increased drastically around the world. All this has resulted in increasing the demand of bitcoin among the people throughout the world. This is evident from the increasing price of bitcoin around the world.
Bitcoin was designed by Satoshi to be used as mode of payment but it suddenly became a store of value (SOV), meaning at it grow and adopted by many, its likely that it will become either of the two. Most casuals like us wants to used it to buy items around the web using it, sadly its not been the case as there are a few stores who are accepting it. However, for those big guys there who has a lot of money, they think bitcoin as a investment portfolio.
But in any case I think it is really good for the ecosystem maybe its not going to be as micro payment scheme as original envision by Satoshi, but at least the market keeps growing and maybe one day we will get to see it being used more to buy around the web.