Indeed, there's a lot of sub $1000 hodlers out there, however the lowest you go the entry points, the higher chances that they will not sell because the lowest the entry point, the highest IQ and therefore understanding of what money is, concepts like hard money, understanding of the risk of holding ponzi fiat scheme currencies contrary to bitcoin, understanding of up and coming bond market collapse and so on. So it's mostly all the crypto kids of class of 2017 that panic sell. Holders before MtGox collapse have been through hell and back and will not find flaws on the fundamentals to sell. Also usually they most likely were very well off before Bitcoin/already sold enough to not need to reduce their BTC position.
When people need money they don't look at anything related to the fundamentals or why Bitcoin is better money than fiat. Bills and most goods are still paid in fiat, which is why OGs will keep selling.
Another thing is that not everyone cares Bitcoin like we here do. I'm sure that most investors are pretty neutral and just look to ride the market as it comes. They will sell without feeling anything other than relief.
I actually would prefer OGs to be unloading some of their coins, because that makes sure their coins are bought up at much higher levels, and it results in a better form of wealth distribution.
Instead of 1 person hodling thousands of coins, we'll see these coins flow in the pockets of potentially hundreds of hodlers.