Yeah, there was a drop of Bitcoin Dominance indicator in the last few days: from 64.9% to 64.7%

(according to
this TradingView page, some other portals may slightly differ or not show any drop at all).
But at the start of April, dominance was actually below 63% according to the same source.
I believe there are currently no indicators of an altcoin season. However, I disagree with others that there will be no altcoin season in the coming months.
Usually the strongest altcoin season is located at the end of a Bitcoin bull market. The mechanism is quite easy to understand: When fear about a potential BTC crash increases, people seek to squeeze out the last bit of profit from the crypto market as long as they can moving into even more riskier assets - which are altcoins. This can and will very likely happen to a certain extent.
I believe however that the altcoin season will be weaker than in 2021 (and MUCH weaker than in 2018), and in fact I expect the Bitcoin dominance to stay firmly above 50% or even 55% for the next few years. The main reason is that Ethereum has become weaker in the past years. And in addition there are no new altcoins really having exploded in this cycle as much as in previous cycles. Yes, we had Solana and XRP bull markets but these coins were already around and relatively strong in the last cycle. The most significant "new" coins are TON and Sui but they have less than 0.5% of the "dominance" share each, so they can't move the indicator much.
It looks like the altcoin fad is coming to an end slowly. Some projects of course will remain strong but there are strong signs of a slow but steady market shakeout. Most altcoins only exist because some people thought they are a "better Bitcoin". But in fact all of them are bound by the same limitations, people are starting to recognize this and use alts only to gamble.