You have to ask yourself what is the point of $1 trillion dollars sitting in a token that is basically not used for anything yet.
I would love to proved wrong but i still don't see the point of all those smart contract things.
On the other hand I do see $1 trillion marketcap possible in bitcoin because simply people will want to hold money outside of conventional assets.
But ETH? I dont see how it can reach $1 trillion outside of a massive bubble or if smart contracts in ETH definitely proven as viable and useful.