If the market cap is 1 trillion, but there are still whales with considerable amount of btc then they will be able to crash the markets.
I wouldn't say it doesn't have anything to do with market cap, but that both things are issues related to stability. The larger the market cap the more money it's going to take to move the market on a day to day basis. But yes, someone who holds a large percentage of coins will have the ability to crash the market in most cases unless the buy support is incredibly large.
Right. Unless they receive some non public information or early public information that might want to cause them to sell all their coins at once. Like some sort of government crackdown or major technical issue. If they feel that they would lose more by holding then that's one situation where they might have more to gain by unloading all their coins at once.
Yeah, hopefully. But there is always going to be some risk just as there is in any technology or any endeavour for that matter.