I think it's natural, because bitcoin mining is now very difficult to get results, maybe because bitcoin prices are very high right now, so many people divert their mines into altcoin, I think altcoin is more profitable to mine than bitcoin.
Maybe you're right, but don't forget that bitcoin price is always increase more than any other altcoin, so you can see the volatility of the price is too big compared to other alternative cryptocurrencies. Currently, I didn't see any chance for altcoin against bitcoin, because there is a big difference in many things like potential and price.