The high fees for bitcoin is only temporary if you're in a hurry then you have no choice but to pay more. Yesterday I only spend less than $10 for my 2 bitcoin transaction. There are solutions for bitcoin but I don't think it's really needed at the moment because the fees can still be reduced.
Bitcoin will never be used for trading. Why?
...as mentioned by the other posts, BTC actually
is used for trading, but I guess you are talking about BTC as a large scale payment network.
He might be talking about trading bitcoins on chain and not off chain.