I wouldn't say it's gonna destroy Bitcoin, but Ethereum is fantastic because it has not only been out there for long time as the #2, but also has an actual use (differently from bitcoin) and in terms of usability is better than bitcoin and improving every day thanks to active developer team and side projects.
Wouldn't call Ethereum "The new BTC" but definitely the second best coin out there.
In terms of market cap it might overtake bitcoin, later on. However, the public is yet to realize that Ethereum is better than Bitcoin, due to the fact that bitcoin is seen as the founder of cryptocurrency.
However, I totally agree with the fact that it is not the new BTC yet in the current stage.