2020 will be a strong year for the Switch indeed. Like liquid said, it has strong momentum on its own right now and is up significantly compared to 2019 with smash in effect. That said, if we see a pro model, it is going to happen this year. So with that in mind and year starting stronger than the past with Pokemon MD and Animal crossing there is no doubt it will be up atleast the first 6 months.
We'll see what other games Nintendo have planned for this year, but I'm sure they have some huge titles to survive the flow of press the next gen consoles will be getting.