To clarify, I am not one of those "who want so much that it goes to the moon", I am more curious about the "Game Theory" aspects of cryptocurriencies
It's not good for economy, because people would spend less, hoping their bitcoins would become even more valuable.
Less spending = less economic activity.
Why would that be a bad thing? Considering that our current economic activity isn't really sustainable.
People would also work less. Why work, if you can just do nothing and watch your bitcoins become more valuable.
Less work = less economic activity.
You seem to think that people are only working to get money, which I think is not the truth. People often have to choose a work which pays more but isn't exactly what they would like to do. Wouldn't it be nice if you could purse your passion and do something that is of value to society instead of working for minimum wage just to survive? The reward would be first and foremost on an emotional level which (imho) is a much more important factor for health and happiness than money could ever be.
People would also invest less in real companies. Why invest in something that grows slow, when you can invest in bitcoin which grows fast?
Less investments = less economic activity.
Maybe the factors that influence the decision to invest into a company will change. For example, a company that is focused on making life on earth more sustainable could be a great investment. On the contrary, parasitically companies who are just focused on profits may get less investment funds.
I hope bitcoin will never go mainstream and rise so fast in value. It could cause total economic collapse.
Maybe, maybe not. What makes you think that our current economy isn't heading for collapse anyway?
And also early adopters would get too rich, while all the later adopters would be in very bad position.
If Bitcoin is truly deflationary, late adopters may join at a time in Bitcoins history where growth will happen in a very slow manner, which is what you seem to suggest should be happening right now.