It's difficult to predict with certainty what will happen to altcoins if btc were to drop to $10, as there are a number of factors that can influence the price of cryptocurrencies. However, it's important to note that altcoins are not solely dependent on btc's price movements, and often have their own unique use cases and market dynamics.

That being said, historically altcoins have been known to follow btc's price movements to some extent. When btc experiences a significant drop in price, it's common for the entire cryptocurrency market to experience a sell-off, which can result in the price of altcoins also dropping.

However, it's worth noting that the cryptocurrency market has become increasingly diverse in recent years, with a wide range of altcoins offering unique features and use cases. This means that some altcoins may be less affected by a drop in btc's price than others.

Well, while it's difficult to predict the exact fate of altcoins if btc were to drop to $10, it's likely that many altcoins would also experience a drop in price to some extent. However, the impact on individual altcoins would depend on a variety of factors, including their use case, market dynamics, and overall demand.

Reference:

https://www.coindesk.com/what-happens-to-altcoins-when-bitcoin-crashes
https://cointelegraph.com/news/what-happens-to-altcoins-if-bitcoin-collapses