The only coin that can challenge Bitcoin is Ethereum. But not now maybe some years to come. People will love it more.
- Sorry, the chance to eth against bitcoin is very low, the existence of bitcoin is a miracle and it has engulfed all heroes in the same era, bitcoin was too strong and received the respect of everyone, want to replace it in this era, that is very difficult. However, as we know, every story will always end and bitcoin can not escape that, the future is always an enemy of bitcoin, the future will create a powerful enough king and defeat bitcoin, creating a new era, and really, we can not know, this king is still a great mystery