I am pretty sure that 98% of altcoins will Die anyway. no matter if Bitcoin Price increase to that point or not. Altcoins are going to die. maybe some major altcoins manage to survive. only 1% or 2%. and rest of them will vanish.
and I think Bitcoin will a lot of time to reach $100k. maybe it take 2 to 5 more years. that's my point of view.
All altcoins will fall into a state of near death, instead of dying completely as you say when the value of bitcoin reaches too high because bitcoin is the main root of all altcoins, the relationship is extremely special, and when this stem needs nutrients to go higher and farther, it will certainly use small tree roots to suck nutrients, altcoins are those roots, it will not die but must work over capacity. Such a tragedy could be called hell in the crypto market, no longer able to keep people from staying, so investors will try to keep a balance if they want to keep making money, instead of creating such a scene, that's my opinion