The entire cryptocurrency industry is still very young and as times goes on, there is possibility for the emergence of new coins with better technology and better usecases than what we can find now. Though Ethereum is the first smart contracts platform but the developers will need to do more if they want to continue to stay relevant in the industry
I understand what you are saying. But you have to take into account the fact that despite some advantages and disadvantages of other platforms, it is ethereum that is the golden mean that provides quite a lot for users of ethereum and for developers of new projects. I am sure that the team of ethereum does not stop at this and as a result we will see an even better product.