Its pretty impressive but its worth to point out that its mostly a pre-merge hype. After its done, after "buy rumours sell facts event" and spectacular dump, bitcoin will come back on top once again.
Exactly as you said that after the merger event is over Bitcoin will again outperform ETH and it is proven even now if we see the price of ethereum coin has dropped to the level of $1.2k and has returned to rank 2 in the market, when the pre-merger Hype came in the price of etherum coin had touched the level of $ 1.7k but it was only temporary and it's only natural that at that time the trading volume of ethereum coin could outperform Bitcoin.
This is why it is important to not get ahead of ourselves, without a doubt the merger was an event that attracted the attention of people all around the world and not only of those that were interested in the market of cryptocurrencies because of the transition ethereum made from proof of work to proof of stake, and it is obvious that what we were seeing was just temporary, like always people need to be way more careful when it comes to the predictions that they make or they run the risk of losing money over those mistaken predictions.