There are some issues which potentially can hinder bitocin price increase, adoption rate and disrupt people's faith in cryptocurrency.
1. Bitcoin ban by China or some other major player. Recent ban of ICO in China showed us that total cryptocurrency ban is not something unreal.
2. A lot of economists predict that Bitcoin might be the biggest bubble of 21th century, for example Nobel Prize winner Robert Shiller stated that bitcoin resembles past market bubbles.
1. The recent ICO ban was a necessity ~ the ICO market has been beaten to the ground by greed and con artists. It's beyond insane how empty projects manage to gather millions dollars worth of funds in a matter of hours.
That's not healthy at all. It shows how toxic that part of the crypto industry has become. For that reason I am actually happy that a government has stepped in to make an end to all this, or at least in China for the time being.
2. If we had to believe economical experts back in the days, Bitcoin wouldn't even manage to reach $1000 again after the disastrous effect of the MtGox closure ~ look where we stand right now.
This bubble talk will continue to be part of Bitcoin for as long as it keeps increasing ~ $1000 was a bubble, $2000 was a bubble, $3000 was a bubble, $4000 was a bubble, and the list goes on. Ignore all this bubble talk.