Dogecoin has gain alot of interest and popularity, but still has a long way to go in terms of replacing Ethereum at CMC. If you check the marketcap, which is the basis of ranking coins at the CMC, you may agree with me that dogecoin is far behind Ethereum on marketcap.
However, in crypto anything can happen, may be investors may invest more on degecoin to boost it's marketcap and subsqeuently replace Ethereum in near future.