Do you think all altcoins will die if bitcoin reach $100k?
nah.. altcoin price relative to USD will go up and relative to BTC will go down then what can occure is the same thing that happened in 2017 when bitcoin dropped from 20k .. (altcoins pumped)
The correlation between the altcoin and Bitcoin determines which altcoins will go up and which altcoin stay at the same price levels in the bull market. This happens due to the higher point correlation and the bull market will not only move the BTC alone. The last drop from $20k for BTC was the fast crash market and the steady growth is required for preventing the next big red candles after the bull market.