don't know how many years it will take for ethereum to overtake bitcoin, but it'll happen for sure
In my opinion you are right, bitcoin is not developing now, we all know it as the first crypto and as crypto with the biggest market cap, but ethereum is completely another thing, A lot of defi projects appear there, and now we all wait for launch of Ethereum 2.0.
Developers try to improve their product and it is noticeable and very valuable.