I don't believe on that opinion if bitcoin boom or reach $100k altcoins die, in own opinion possible if bitcoin price at $100k at the market cap altcoin will follow to raised and become useful in trading.
Let's talk for the reality that's speculation as now is very impossible to reach even do bitcoin starting to uprising their price at the recent days $20k or upto $30k that amount possible to reach before end of this year if the bullish continue to increase.