I do not think that there are other coins that will use bitcoin. Because bitcoin itself is the mother of cryptocurrency. So if there are other coins that beat bitcoin then I think cryptocurrency will start from scratch again. But I do not believe that there are other coins that beat bitcoin. Bitcoin will continue to be at the top and followed by some other coins.
Yes i agree with you. I am confident about the capability of bitcoin to be on the top. However, we could not predict what will really happen in the future. I hope bitcoin will really last longer.