Not sure what your idea of strength is when you are quoting that article.
But right now btc dominance is over 68%. I was surprised that in early july ethereum had about a 28% dominance. Which was strange and bitcoin dominance back then fell to below 40% for the first time in a long time.
Don't underestimate Ethereum just yet. There are still a lot of coins based of Ethereum, and that makes it a strong coin. I hope that it will replace that slow Bitcoin so that i can make faster transactions with Ethereum
Did you just read that article strength of bitcoin, if you had read it carefully, you will understand that there is nothing that can bit bitcoin because it has been designed to be unbeatable. Do you know since when Ethereum has been created? Rather than Ethereum gaining popularity, it has been having series of decline in price because most of the communities are beginning to shift their base from Ethereum to that slow system of bitcoin you said.
Bitcoin might be slow, but it is a necessary and wanted evil and it would be better we stick with the devil that you know that the angel that we dont know. Bitcoin has been slow but I have near had any reason to really have a failed transaction, and I have been using it for payment since i got to know about it.