I am confident that NEO will rise it's price value over time especially on 2019 but I really don't think it could surpass Bitcoin in a couple of years.
when the Crypto market increases it's global market capitalization then so as Ethereum, and Ripple that Neo's main rival for beating Bitcoin's market cap.
I don't think NEO could surpass Bitcoin, but there's possibility that it could surpass Ripple and Ethereum.