I really think your reasoning is quite farfetched and quite impossible to happen, but hey. At least you gave us an actual explanation instead of posts like "bitcoin at $5k soon, trust me".
Currently we have 17 mil bitcoins according to statistics 4-6mil are already lost(forgotten pasword, burned during wrong transfers etc). That gives us 11 mil of bitcoins. Few mils are stuck on wallets where they have to be (for example mt gox wallet), on longtime hodlers etc. Lets say that we have 8 mil of bitcoins that can be possibly dump.
How do you even know that 4-6mil are "lost"? You can't prove that.