it's not clear what you mean by "used" for trading. if you mean on-chain atomic trading using the BTC blockchain, of course it's not good for that. block space is too precious. if it weren't, there would be little to separate BTC from centralized payment and messaging protocols. and the lightning network (as is) doesn't supply a reliable trust model for atomic trading. that could take many years to develop and implement in BTC, if ever.

here's the answer: we don't need bitcoin to be be the backbone for on-chain trading. there are decentralized exchange technologies emerging. one DEX model is for all currencies to be deposited into one wallet, controlled by the user. using smart contracts and timelocks, you can use those currencies as collateral for trading on a separate blockchain, which isn't subject to the limited capacity that bitcoin is. since the collateral is all time-locked, you don't need to pay BTC miner fees to trade it.