Earlier today, USDT became the second largest cryptocurrency by market cap, overtaking Ethereum. Currently, ETH has recovered its spot, but the difference is less than $1 billion. I imagine USDT will retake the position again and begin to pull ahead.
ETH is the worst performer in the top 20 right now which shows how weak it is. Without Tom Lee it would have fallen to third place sooner.

In the future it will be a lot harder for ETH to retake USDT when Tether is growing its USDT market capitalization like there is no tomorrow, this thing is printing supply every year with how much the demand is for tokenized USD from various institutional players.
In 2025 USDT grown 36% of its total supply within a year, 2nd rank going to be USDT's for a long time. Good thing ETH is back to #2 again after a small bounce. The only saving grace is another bullrun and ATH breaking surges.