According to github statistics there were 296 contributors in Doge's development. It has been more than a year sine last change was made. It is quite possible that in private space some work at some level might be carried out. When and if there will be need of any change or improvement in anything we will be seeing movement on it. This no move in market has been for quite some time this indicates breakout anytime.
Moreover, there are still open issues to be resolved by the developers yet we see little development activity. I do think projects needs to have continuous development to be able to compete with other cryptocurrencies since innovation will be a key factor in determining this coin's success.