Bitcoin's recent price drop to $66,534 has sparked concerns among investors, but some analysts believe that a surge above $68,000 could trigger a rally in select altcoins. According to market intelligence firm Santiment, Bitcoin's dip to $66,600 saw a surge in buying, while selling interest remained dormant. This optimism is also reflected in the expected launch of spot Ether exchange-traded funds (ETFs) in July, which could boost demand for Ether.

Despite Bitcoin's weakness, some altcoins are showing strength on the charts. Toncoin (TON) completed a bullish ascending triangle pattern and could rally to $10 if it sustains above $7.67. Uniswap (UNI) turned up from the 50-day SMA and reached the overhead resistance of $12, suggesting a potential rally to $15. Monero (XMR) has been rising for several days and could continue its uptrend if it breaks above $180.

However, it's important to note that the cryptocurrency market is highly volatile, and investors should conduct thorough research and analysis before making any investment decisions. Additionally, the upcoming Ethereum Pectra upgrade in 2025 poses significant risks, including concerns over client, operator, and cloud diversity, according to a recent research report.

In conclusion, while Bitcoin's price resurgence could be a catalyst for altcoin growth, investors should exercise caution and consider the potential risks involved. It's essential to stay informed and up-to-date on market trends and analysis to make informed investment decisions.