Lightning Network is trying to give Bitcoin what Steem has for long time. I personally don't believe that Bitcoin will be the coin to dominate the entire market, I believw that it is very popular right now, at least for the people new to the crypto world and this is what it keeps it as a top coin. Its performances are not that high and by the time people get more educated about crypto, they will find out that there are a lot of cryptocurrencies to invest in, and not only Bitcoin, many of them being more promising than Bitcoin.