~when everyone owns a Bitcoin who then will care about it as it will be as common and a boring investment.
Where do you get the theory? And why don't you tell me a clear explanation that a common thing will be a boring investment? You must know Gold, it was already a common thing for years, right? But why it never becomes a boring asset? 
Mate, your theory is truly weird and seems like a Bitcoin hater's saying. I bet you have a bad experience in Bitcoin investment or trading. 
>I suggest you learn more about investment and look deeply at Bitcoin's purpose!!
If the bitcoin investment is boring for you then it only meand that you do not have passion on it. It is not bad after all because we humans have different preferences in life. Maybe for you bitcoin is boring investment but for others it is not boring and they are really excited whenever they do trading.