Ethereum is a threat to bitcoin? Yes it is. We all know that ethereum was created by a russian programmer on 2013, and it was launched on 2015. After 3 years it is next to bitcoin in terms of popularity and value.
Let me show you some NBA perspective on this, bitcoin is the king of cryptocurrency right? same as LeBron as the king of NBA. But here comes ethereum the prince of cryptocurrency just like Ben Simmons as the prince of the NBA. The prince will dethrone the king on the eastern conference finals same as ethereum that will dethrone bitcoin in the next couple of years. Wether we like it or not the king will reach its limit. Mark my word. Trust the ethereum process!
Until now Bitcoin was still the king of Cryptocurrency. And I suppose the development process of Ethereum is very long. Ethereum is indeed a very good coin and has a good potential to become a Cryptocurrency king to replace Bitcoin.
However, to date, Ethereum has not become a king and I see that the growth of Ethereum price is following the growth of Bitcoin price. I think the Ethereum process of being a king will happen for the next few years.