I'm scared about the idea that Bitmain is holding a huge amount of BTC which they mined in the early years of ASIC mining equipment and that they will sell all their BTC at once, causing the most fatal crash in the complete history of BTC.
That would not be in their interest. If they have a very large amount they simply cannot sell them all at once, who would be all the buyers?
Maybe one day they'll quit producing ASICS and they want to "cash out" and they're going to live the rest of their life (and the kids of their kids probably too) as millionaires.
They could dump their BTC for 3/4 or 1/2 of the price and everyone will buy it like a fool because it's the lowest price for a long time.
At that point in time, BTC may be established everywhere in the world and they would be sure that BTC will recover even after dumping a huge load.
Yes, more likely is that they will slowly start selling off their bitcoin, if not already done. Plus if they have a good business model why change? They are moving into Litecoin and Dash now.