That gap between 2018 and 2019 is just going to keep increasing every week. Nintendo didn't really release anything major last year until the end of 2018. This year they are already tracking ahead, and you can bet they are going to have a better release schedule this year.
Hmm, as Rol pointed out, I don't believe the baseline is much growing this year. Maybe a few K, enough to keep the Switch consistently above 40K without dips below like last year. The reason for that is mostly - that the Switch already sold pretty great in japan. There simply is not too much potential for growth.
This is different in the US and especially europe though. The Switch has the clear potential to grow here - let's see if it can fulfill that potential.
But back to Japan - I still see Switch up against last year. But not because of the baseline, but because of the game release peaks. Even last year some games boosted the sales around 5K-10K. I expect to see such releases more often this year. Additionally there will be bigger peaks on DQ11, Yokai Watch and Animal Crossing. And the holidays will be crazy because of Pokemon.