May I laugh at very very loudly right now? if you want to make most people panic, please, make us more and more extreme and worried issues and conditions. What you have said in this post is a very usual problem to talk about and everyone has known about it. Most Bitcoin holder or trader has realized about this as one of the risks, but so far they can overcome it and make more and more profits. So, stop making this kind of fud that makes no sense.
Therefore people will switch to altcoins, which are much more fast, and Bitcoin price will drop, altcoin price will go up.
My second laugh, well, it is your choice if you want to switch your BTC to altcoins. but for me personally, it is a bad decision, I will never do it. keep my BTC on my portfolio as the most coin to hold or trade. And if I have some altcoins, they are also supporting, not as a replacement of BTC.