As Bitcoin mining is partially controlled by Chinese miners, I have a feeling that sometime in the near future, Bitcoin can become centralized if no solution against this is proposed.
How do you know that is partially controlled by Chinese miners? Every time I read some news about mining, price, exchange etc 99% of the cases mention Chinese. And the majority of the time after some months/year we find out that Chinese have nothing to do or have a minimal impact of this or that situation. They're becoming like something mythological...