People forget that BTC went from 6k to 20k in 3 weeks. While I'm not convinced we get to 1T this year.
It was a speculative move, but since that time a lot of time has passed and the market has consolidated. With the next speculative move, market capitalization will easily surpass the one trillion dollar figure.
In the world of crypto currencies, anything can happen, I would not even be surprised if the capitalization is really one trillion dollar this year. Personally, I'll take a wait-and-see attitude and watch this show. We are waiting for very amazing things.